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postgresql/contrib/pg_trgm/expected/pg_trgm.out
Alexander Korotkov 4b754d6c16 Avoid full scan of GIN indexes when possible 
The strategy of GIN index scan is driven by opclass-specific extract_query
method.  This method that needed search mode is GIN_SEARCH_MODE_ALL.  This
mode means that matching tuple may contain none of extracted entries.  Simple
example is '!term' tsquery, which doesn't need any term to exist in matching
tsvector.

In order to handle such scan key GIN calculates virtual entry, which contains
all TIDs of all entries of attribute.  In fact this is full scan of index
attribute.  And typically this is very slow, but allows to handle some queries
correctly in GIN.  However, current algorithm calculate such virtual entry for
each GIN_SEARCH_MODE_ALL scan key even if they are multiple for the same
attribute.  This is clearly not optimal.

This commit improves the situation by introduction of "exclude only" scan keys.
Such scan keys are not capable to return set of matching TIDs.  Instead, they
are capable only to filter TIDs produced by normal scan keys.  Therefore,
each attribute should contain at least one normal scan key, while rest of them
may be "exclude only" if search mode is GIN_SEARCH_MODE_ALL.

The same optimization might be applied to the whole scan, not per-attribute.
But that leads to NULL values elimination problem.  There is trade-off between
multiple possible ways to do this.  We probably want to do this later using
some cost-based decision algorithm.

Discussion: https://postgr.es/m/CAOBaU_YGP5-BEt5Cc0%3DzMve92vocPzD%2BXiZgiZs1kjY0cj%3DXBg%40mail.gmail.com
Author: Nikita Glukhov, Alexander Korotkov, Tom Lane, Julien Rouhaud
Reviewed-by: Julien Rouhaud, Tomas Vondra, Tom Lane
2020-01-18 01:11:39 +03:00

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CREATE EXTENSION pg_trgm;
-- Check whether any of our opclasses fail amvalidate
SELECT amname, opcname
FROM pg_opclass opc LEFT JOIN pg_am am ON am.oid = opcmethod
WHERE opc.oid >= 16384 AND NOT amvalidate(opc.oid);
amname | opcname
--------+---------
(0 rows)
--backslash is used in tests below, installcheck will fail if
--standard_conforming_string is off
set standard_conforming_strings=on;
-- reduce noise
set extra_float_digits = 0;
select show_trgm('');
show_trgm
-----------
{}
(1 row)
select show_trgm('(*&^$@%@');
show_trgm
-----------
{}
(1 row)
select show_trgm('a b c');
show_trgm
---------------------------------------
{" a"," b"," c"," a "," b "," c "}
(1 row)
select show_trgm(' a b c ');
show_trgm
---------------------------------------
{" a"," b"," c"," a "," b "," c "}
(1 row)
select show_trgm('aA bB cC');
show_trgm
---------------------------------------------------------
{" a"," b"," c"," aa"," bb"," cc","aa ","bb ","cc "}
(1 row)
select show_trgm(' aA bB cC ');
show_trgm
---------------------------------------------------------
{" a"," b"," c"," aa"," bb"," cc","aa ","bb ","cc "}
(1 row)
select show_trgm('a b C0*%^');
show_trgm
---------------------------------------------
{" a"," b"," c"," a "," b "," c0","c0 "}
(1 row)
select similarity('wow','WOWa ');
similarity
------------
0.5
(1 row)
select similarity('wow',' WOW ');
similarity
------------
1
(1 row)
select similarity('---', '####---');
similarity
------------
0
(1 row)
CREATE TABLE test_trgm(t text COLLATE "C");
\copy test_trgm from 'data/trgm.data'
select t,similarity(t,'qwertyu0988') as sml from test_trgm where t % 'qwertyu0988' order by sml desc, t;
t | sml
-------------+----------
qwertyu0988 | 1
qwertyu0980 | 0.714286
qwertyu0981 | 0.714286
qwertyu0982 | 0.714286
qwertyu0983 | 0.714286
qwertyu0984 | 0.714286
qwertyu0985 | 0.714286
qwertyu0986 | 0.714286
qwertyu0987 | 0.714286
qwertyu0989 | 0.714286
qwertyu0088 | 0.6
qwertyu0098 | 0.6
qwertyu0188 | 0.6
qwertyu0288 | 0.6
qwertyu0388 | 0.6
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qwertyu0588 | 0.6
qwertyu0688 | 0.6
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qwertyu0888 | 0.6
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qwertyu0476 | 0.5
qwertyu0477 | 0.5
qwertyu0478 | 0.5
qwertyu0479 | 0.5
qwertyu0480 | 0.5
qwertyu0481 | 0.5
qwertyu0482 | 0.5
qwertyu0483 | 0.5
qwertyu0484 | 0.5
qwertyu0485 | 0.5
qwertyu0486 | 0.5
qwertyu0487 | 0.5
qwertyu0489 | 0.5
qwertyu0490 | 0.5
qwertyu0491 | 0.5
qwertyu0492 | 0.5
qwertyu0493 | 0.5
qwertyu0494 | 0.5
qwertyu0495 | 0.5
qwertyu0496 | 0.5
qwertyu0497 | 0.5
qwertyu0498 | 0.5
qwertyu0499 | 0.5
qwertyu0500 | 0.5
qwertyu0501 | 0.5
qwertyu0502 | 0.5
qwertyu0503 | 0.5
qwertyu0504 | 0.5
qwertyu0505 | 0.5
qwertyu0506 | 0.5
qwertyu0507 | 0.5
qwertyu0508 | 0.5
qwertyu0509 | 0.5
qwertyu0510 | 0.5
qwertyu0511 | 0.5
qwertyu0512 | 0.5
qwertyu0513 | 0.5
qwertyu0514 | 0.5
qwertyu0515 | 0.5
qwertyu0516 | 0.5
qwertyu0517 | 0.5
qwertyu0518 | 0.5
qwertyu0519 | 0.5
qwertyu0520 | 0.5
qwertyu0521 | 0.5
qwertyu0522 | 0.5
qwertyu0523 | 0.5
qwertyu0524 | 0.5
qwertyu0525 | 0.5
qwertyu0526 | 0.5
qwertyu0527 | 0.5
qwertyu0528 | 0.5
qwertyu0529 | 0.5
qwertyu0530 | 0.5
qwertyu0531 | 0.5
qwertyu0532 | 0.5
qwertyu0533 | 0.5
qwertyu0534 | 0.5
qwertyu0535 | 0.5
qwertyu0536 | 0.5
qwertyu0537 | 0.5
qwertyu0538 | 0.5
qwertyu0539 | 0.5
qwertyu0540 | 0.5
qwertyu0541 | 0.5
qwertyu0542 | 0.5
qwertyu0543 | 0.5
qwertyu0544 | 0.5
qwertyu0545 | 0.5
qwertyu0546 | 0.5
qwertyu0547 | 0.5
qwertyu0548 | 0.5
qwertyu0549 | 0.5
qwertyu0550 | 0.5
qwertyu0551 | 0.5
qwertyu0552 | 0.5
qwertyu0553 | 0.5
qwertyu0554 | 0.5
qwertyu0555 | 0.5
qwertyu0556 | 0.5
qwertyu0557 | 0.5
qwertyu0558 | 0.5
qwertyu0559 | 0.5
qwertyu0560 | 0.5
qwertyu0561 | 0.5
qwertyu0562 | 0.5
qwertyu0563 | 0.5
qwertyu0564 | 0.5
qwertyu0565 | 0.5
qwertyu0566 | 0.5
qwertyu0567 | 0.5
qwertyu0568 | 0.5
qwertyu0569 | 0.5
qwertyu0570 | 0.5
qwertyu0571 | 0.5
qwertyu0572 | 0.5
qwertyu0573 | 0.5
qwertyu0574 | 0.5
qwertyu0575 | 0.5
qwertyu0576 | 0.5
qwertyu0577 | 0.5
qwertyu0578 | 0.5
qwertyu0579 | 0.5
qwertyu0580 | 0.5
qwertyu0581 | 0.5
qwertyu0582 | 0.5
qwertyu0583 | 0.5
qwertyu0584 | 0.5
qwertyu0585 | 0.5
qwertyu0586 | 0.5
qwertyu0587 | 0.5
qwertyu0589 | 0.5
qwertyu0590 | 0.5
qwertyu0591 | 0.5
qwertyu0592 | 0.5
qwertyu0593 | 0.5
qwertyu0594 | 0.5
qwertyu0595 | 0.5
qwertyu0596 | 0.5
qwertyu0597 | 0.5
qwertyu0598 | 0.5
qwertyu0599 | 0.5
qwertyu0600 | 0.5
qwertyu0601 | 0.5
qwertyu0602 | 0.5
qwertyu0603 | 0.5
qwertyu0604 | 0.5
qwertyu0605 | 0.5
qwertyu0606 | 0.5
qwertyu0607 | 0.5
qwertyu0608 | 0.5
qwertyu0609 | 0.5
qwertyu0610 | 0.5
qwertyu0611 | 0.5
qwertyu0612 | 0.5
qwertyu0613 | 0.5
qwertyu0614 | 0.5
qwertyu0615 | 0.5
qwertyu0616 | 0.5
qwertyu0617 | 0.5
qwertyu0618 | 0.5
qwertyu0619 | 0.5
qwertyu0620 | 0.5
qwertyu0621 | 0.5
qwertyu0622 | 0.5
qwertyu0623 | 0.5
qwertyu0624 | 0.5
qwertyu0625 | 0.5
qwertyu0626 | 0.5
qwertyu0627 | 0.5
qwertyu0628 | 0.5
qwertyu0629 | 0.5
qwertyu0630 | 0.5
qwertyu0631 | 0.5
qwertyu0632 | 0.5
qwertyu0633 | 0.5
qwertyu0634 | 0.5
qwertyu0635 | 0.5
qwertyu0636 | 0.5
qwertyu0637 | 0.5
qwertyu0638 | 0.5
qwertyu0639 | 0.5
qwertyu0640 | 0.5
qwertyu0641 | 0.5
qwertyu0642 | 0.5
qwertyu0643 | 0.5
qwertyu0644 | 0.5
qwertyu0645 | 0.5
qwertyu0646 | 0.5
qwertyu0647 | 0.5
qwertyu0648 | 0.5
qwertyu0649 | 0.5
qwertyu0650 | 0.5
qwertyu0651 | 0.5
qwertyu0652 | 0.5
qwertyu0653 | 0.5
qwertyu0654 | 0.5
qwertyu0655 | 0.5
qwertyu0656 | 0.5
qwertyu0657 | 0.5
qwertyu0658 | 0.5
qwertyu0659 | 0.5
qwertyu0660 | 0.5
qwertyu0661 | 0.5
qwertyu0662 | 0.5
qwertyu0663 | 0.5
qwertyu0664 | 0.5
qwertyu0665 | 0.5
qwertyu0666 | 0.5
qwertyu0667 | 0.5
qwertyu0668 | 0.5
qwertyu0669 | 0.5
qwertyu0670 | 0.5
qwertyu0671 | 0.5
qwertyu0672 | 0.5
qwertyu0673 | 0.5
qwertyu0674 | 0.5
qwertyu0675 | 0.5
qwertyu0676 | 0.5
qwertyu0677 | 0.5
qwertyu0678 | 0.5
qwertyu0679 | 0.5
qwertyu0680 | 0.5
qwertyu0681 | 0.5
qwertyu0682 | 0.5
qwertyu0683 | 0.5
qwertyu0684 | 0.5
qwertyu0685 | 0.5
qwertyu0686 | 0.5
qwertyu0687 | 0.5
qwertyu0689 | 0.5
qwertyu0690 | 0.5
qwertyu0691 | 0.5
qwertyu0692 | 0.5
qwertyu0693 | 0.5
qwertyu0694 | 0.5
qwertyu0695 | 0.5
qwertyu0696 | 0.5
qwertyu0697 | 0.5
qwertyu0698 | 0.5
qwertyu0699 | 0.5
qwertyu0700 | 0.5
qwertyu0701 | 0.5
qwertyu0702 | 0.5
qwertyu0703 | 0.5
qwertyu0704 | 0.5
qwertyu0705 | 0.5
qwertyu0706 | 0.5
qwertyu0707 | 0.5
qwertyu0708 | 0.5
qwertyu0709 | 0.5
qwertyu0710 | 0.5
qwertyu0711 | 0.5
qwertyu0712 | 0.5
qwertyu0713 | 0.5
qwertyu0714 | 0.5
qwertyu0715 | 0.5
qwertyu0716 | 0.5
qwertyu0717 | 0.5
qwertyu0718 | 0.5
qwertyu0719 | 0.5
qwertyu0720 | 0.5
qwertyu0721 | 0.5
qwertyu0722 | 0.5
qwertyu0723 | 0.5
qwertyu0724 | 0.5
qwertyu0725 | 0.5
qwertyu0726 | 0.5
qwertyu0727 | 0.5
qwertyu0728 | 0.5
qwertyu0729 | 0.5
qwertyu0730 | 0.5
qwertyu0731 | 0.5
qwertyu0732 | 0.5
qwertyu0733 | 0.5
qwertyu0734 | 0.5
qwertyu0735 | 0.5
qwertyu0736 | 0.5
qwertyu0737 | 0.5
qwertyu0738 | 0.5
qwertyu0739 | 0.5
qwertyu0740 | 0.5
qwertyu0741 | 0.5
qwertyu0742 | 0.5
qwertyu0743 | 0.5
qwertyu0744 | 0.5
qwertyu0745 | 0.5
qwertyu0746 | 0.5
qwertyu0747 | 0.5
qwertyu0748 | 0.5
qwertyu0749 | 0.5
qwertyu0750 | 0.5
qwertyu0751 | 0.5
qwertyu0752 | 0.5
qwertyu0753 | 0.5
qwertyu0754 | 0.5
qwertyu0755 | 0.5
qwertyu0756 | 0.5
qwertyu0757 | 0.5
qwertyu0758 | 0.5
qwertyu0759 | 0.5
qwertyu0760 | 0.5
qwertyu0761 | 0.5
qwertyu0762 | 0.5
qwertyu0763 | 0.5
qwertyu0764 | 0.5
qwertyu0765 | 0.5
qwertyu0766 | 0.5
qwertyu0767 | 0.5
qwertyu0768 | 0.5
qwertyu0769 | 0.5
qwertyu0770 | 0.5
qwertyu0771 | 0.5
qwertyu0772 | 0.5
qwertyu0773 | 0.5
qwertyu0774 | 0.5
qwertyu0775 | 0.5
qwertyu0776 | 0.5
qwertyu0777 | 0.5
qwertyu0778 | 0.5
qwertyu0779 | 0.5
qwertyu0780 | 0.5
qwertyu0781 | 0.5
qwertyu0782 | 0.5
qwertyu0783 | 0.5
qwertyu0784 | 0.5
qwertyu0785 | 0.5
qwertyu0786 | 0.5
qwertyu0787 | 0.5
qwertyu0789 | 0.5
qwertyu0790 | 0.5
qwertyu0791 | 0.5
qwertyu0792 | 0.5
qwertyu0793 | 0.5
qwertyu0794 | 0.5
qwertyu0795 | 0.5
qwertyu0796 | 0.5
qwertyu0797 | 0.5
qwertyu0798 | 0.5
qwertyu0799 | 0.5
qwertyu0800 | 0.5
qwertyu0801 | 0.5
qwertyu0802 | 0.5
qwertyu0803 | 0.5
qwertyu0804 | 0.5
qwertyu0805 | 0.5
qwertyu0806 | 0.5
qwertyu0807 | 0.5
qwertyu0808 | 0.5
qwertyu0809 | 0.5
qwertyu0810 | 0.5
qwertyu0811 | 0.5
qwertyu0812 | 0.5
qwertyu0813 | 0.5
qwertyu0814 | 0.5
qwertyu0815 | 0.5
qwertyu0816 | 0.5
qwertyu0817 | 0.5
qwertyu0818 | 0.5
qwertyu0819 | 0.5
qwertyu0820 | 0.5
qwertyu0821 | 0.5
qwertyu0822 | 0.5
qwertyu0823 | 0.5
qwertyu0824 | 0.5
qwertyu0825 | 0.5
qwertyu0826 | 0.5
qwertyu0827 | 0.5
qwertyu0828 | 0.5
qwertyu0829 | 0.5
qwertyu0830 | 0.5
qwertyu0831 | 0.5
qwertyu0832 | 0.5
qwertyu0833 | 0.5
qwertyu0834 | 0.5
qwertyu0835 | 0.5
qwertyu0836 | 0.5
qwertyu0837 | 0.5
qwertyu0838 | 0.5
qwertyu0839 | 0.5
qwertyu0840 | 0.5
qwertyu0841 | 0.5
qwertyu0842 | 0.5
qwertyu0843 | 0.5
qwertyu0844 | 0.5
qwertyu0845 | 0.5
qwertyu0846 | 0.5
qwertyu0847 | 0.5
qwertyu0848 | 0.5
qwertyu0849 | 0.5
qwertyu0850 | 0.5
qwertyu0851 | 0.5
qwertyu0852 | 0.5
qwertyu0853 | 0.5
qwertyu0854 | 0.5
qwertyu0855 | 0.5
qwertyu0856 | 0.5
qwertyu0857 | 0.5
qwertyu0858 | 0.5
qwertyu0859 | 0.5
qwertyu0860 | 0.5
qwertyu0861 | 0.5
qwertyu0862 | 0.5
qwertyu0863 | 0.5
qwertyu0864 | 0.5
qwertyu0865 | 0.5
qwertyu0866 | 0.5
qwertyu0867 | 0.5
qwertyu0868 | 0.5
qwertyu0869 | 0.5
qwertyu0870 | 0.5
qwertyu0871 | 0.5
qwertyu0872 | 0.5
qwertyu0873 | 0.5
qwertyu0874 | 0.5
qwertyu0875 | 0.5
qwertyu0876 | 0.5
qwertyu0877 | 0.5
qwertyu0878 | 0.5
qwertyu0879 | 0.5
qwertyu0880 | 0.5
qwertyu0881 | 0.5
qwertyu0882 | 0.5
qwertyu0883 | 0.5
qwertyu0884 | 0.5
qwertyu0885 | 0.5
qwertyu0886 | 0.5
qwertyu0887 | 0.5
qwertyu0889 | 0.5
qwertyu0890 | 0.5
qwertyu0891 | 0.5
qwertyu0892 | 0.5
qwertyu0893 | 0.5
qwertyu0894 | 0.5
qwertyu0895 | 0.5
qwertyu0896 | 0.5
qwertyu0897 | 0.5
qwertyu0898 | 0.5
qwertyu0899 | 0.5
qwertyu1000 | 0.411765
(1000 rows)
select t,similarity(t,'gwertyu0988') as sml from test_trgm where t % 'gwertyu0988' order by sml desc, t;
t | sml
-------------+----------
qwertyu0988 | 0.6
qwertyu0980 | 0.411765
qwertyu0981 | 0.411765
qwertyu0982 | 0.411765
qwertyu0983 | 0.411765
qwertyu0984 | 0.411765
qwertyu0985 | 0.411765
qwertyu0986 | 0.411765
qwertyu0987 | 0.411765
qwertyu0989 | 0.411765
qwertyu0088 | 0.333333
qwertyu0098 | 0.333333
qwertyu0188 | 0.333333
qwertyu0288 | 0.333333
qwertyu0388 | 0.333333
qwertyu0488 | 0.333333
qwertyu0588 | 0.333333
qwertyu0688 | 0.333333
qwertyu0788 | 0.333333
qwertyu0888 | 0.333333
qwertyu0900 | 0.333333
qwertyu0901 | 0.333333
qwertyu0902 | 0.333333
qwertyu0903 | 0.333333
qwertyu0904 | 0.333333
qwertyu0905 | 0.333333
qwertyu0906 | 0.333333
qwertyu0907 | 0.333333
qwertyu0908 | 0.333333
qwertyu0909 | 0.333333
qwertyu0910 | 0.333333
qwertyu0911 | 0.333333
qwertyu0912 | 0.333333
qwertyu0913 | 0.333333
qwertyu0914 | 0.333333
qwertyu0915 | 0.333333
qwertyu0916 | 0.333333
qwertyu0917 | 0.333333
qwertyu0918 | 0.333333
qwertyu0919 | 0.333333
qwertyu0920 | 0.333333
qwertyu0921 | 0.333333
qwertyu0922 | 0.333333
qwertyu0923 | 0.333333
qwertyu0924 | 0.333333
qwertyu0925 | 0.333333
qwertyu0926 | 0.333333
qwertyu0927 | 0.333333
qwertyu0928 | 0.333333
qwertyu0929 | 0.333333
qwertyu0930 | 0.333333
qwertyu0931 | 0.333333
qwertyu0932 | 0.333333
qwertyu0933 | 0.333333
qwertyu0934 | 0.333333
qwertyu0935 | 0.333333
qwertyu0936 | 0.333333
qwertyu0937 | 0.333333
qwertyu0938 | 0.333333
qwertyu0939 | 0.333333
qwertyu0940 | 0.333333
qwertyu0941 | 0.333333
qwertyu0942 | 0.333333
qwertyu0943 | 0.333333
qwertyu0944 | 0.333333
qwertyu0945 | 0.333333
qwertyu0946 | 0.333333
qwertyu0947 | 0.333333
qwertyu0948 | 0.333333
qwertyu0949 | 0.333333
qwertyu0950 | 0.333333
qwertyu0951 | 0.333333
qwertyu0952 | 0.333333
qwertyu0953 | 0.333333
qwertyu0954 | 0.333333
qwertyu0955 | 0.333333
qwertyu0956 | 0.333333
qwertyu0957 | 0.333333
qwertyu0958 | 0.333333
qwertyu0959 | 0.333333
qwertyu0960 | 0.333333
qwertyu0961 | 0.333333
qwertyu0962 | 0.333333
qwertyu0963 | 0.333333
qwertyu0964 | 0.333333
qwertyu0965 | 0.333333
qwertyu0966 | 0.333333
qwertyu0967 | 0.333333
qwertyu0968 | 0.333333
qwertyu0969 | 0.333333
qwertyu0970 | 0.333333
qwertyu0971 | 0.333333
qwertyu0972 | 0.333333
qwertyu0973 | 0.333333
qwertyu0974 | 0.333333
qwertyu0975 | 0.333333
qwertyu0976 | 0.333333
qwertyu0977 | 0.333333
qwertyu0978 | 0.333333
qwertyu0979 | 0.333333
qwertyu0990 | 0.333333
qwertyu0991 | 0.333333
qwertyu0992 | 0.333333
qwertyu0993 | 0.333333
qwertyu0994 | 0.333333
qwertyu0995 | 0.333333
qwertyu0996 | 0.333333
qwertyu0997 | 0.333333
qwertyu0998 | 0.333333
qwertyu0999 | 0.333333
(110 rows)
select t,similarity(t,'gwertyu1988') as sml from test_trgm where t % 'gwertyu1988' order by sml desc, t;
t | sml
-------------+----------
qwertyu0988 | 0.333333
(1 row)
select t <-> 'q0987wertyu0988', t from test_trgm order by t <-> 'q0987wertyu0988' limit 2;
?column? | t
----------+-------------
0.411765 | qwertyu0988
0.5 | qwertyu0987
(2 rows)
select count(*) from test_trgm where t ~ '[qwerty]{2}-?[qwerty]{2}';
count
-------
1000
(1 row)
create index trgm_idx on test_trgm using gist (t gist_trgm_ops);
set enable_seqscan=off;
select t,similarity(t,'qwertyu0988') as sml from test_trgm where t % 'qwertyu0988' order by sml desc, t;
t | sml
-------------+----------
qwertyu0988 | 1
qwertyu0980 | 0.714286
qwertyu0981 | 0.714286
qwertyu0982 | 0.714286
qwertyu0983 | 0.714286
qwertyu0984 | 0.714286
qwertyu0985 | 0.714286
qwertyu0986 | 0.714286
qwertyu0987 | 0.714286
qwertyu0989 | 0.714286
qwertyu0088 | 0.6
qwertyu0098 | 0.6
qwertyu0188 | 0.6
qwertyu0288 | 0.6
qwertyu0388 | 0.6
qwertyu0488 | 0.6
qwertyu0588 | 0.6
qwertyu0688 | 0.6
qwertyu0788 | 0.6
qwertyu0888 | 0.6
qwertyu0900 | 0.6
qwertyu0901 | 0.6
qwertyu0902 | 0.6
qwertyu0903 | 0.6
qwertyu0904 | 0.6
qwertyu0905 | 0.6
qwertyu0906 | 0.6
qwertyu0907 | 0.6
qwertyu0908 | 0.6
qwertyu0909 | 0.6
qwertyu0910 | 0.6
qwertyu0911 | 0.6
qwertyu0912 | 0.6
qwertyu0913 | 0.6
qwertyu0914 | 0.6
qwertyu0915 | 0.6
qwertyu0916 | 0.6
qwertyu0917 | 0.6
qwertyu0918 | 0.6
qwertyu0919 | 0.6
qwertyu0920 | 0.6
qwertyu0921 | 0.6
qwertyu0922 | 0.6
qwertyu0923 | 0.6
qwertyu0924 | 0.6
qwertyu0925 | 0.6
qwertyu0926 | 0.6
qwertyu0927 | 0.6
qwertyu0928 | 0.6
qwertyu0929 | 0.6
qwertyu0930 | 0.6
qwertyu0931 | 0.6
qwertyu0932 | 0.6
qwertyu0933 | 0.6
qwertyu0934 | 0.6
qwertyu0935 | 0.6
qwertyu0936 | 0.6
qwertyu0937 | 0.6
qwertyu0938 | 0.6
qwertyu0939 | 0.6
qwertyu0940 | 0.6
qwertyu0941 | 0.6
qwertyu0942 | 0.6
qwertyu0943 | 0.6
qwertyu0944 | 0.6
qwertyu0945 | 0.6
qwertyu0946 | 0.6
qwertyu0947 | 0.6
qwertyu0948 | 0.6
qwertyu0949 | 0.6
qwertyu0950 | 0.6
qwertyu0951 | 0.6
qwertyu0952 | 0.6
qwertyu0953 | 0.6
qwertyu0954 | 0.6
qwertyu0955 | 0.6
qwertyu0956 | 0.6
qwertyu0957 | 0.6
qwertyu0958 | 0.6
qwertyu0959 | 0.6
qwertyu0960 | 0.6
qwertyu0961 | 0.6
qwertyu0962 | 0.6
qwertyu0963 | 0.6
qwertyu0964 | 0.6
qwertyu0965 | 0.6
qwertyu0966 | 0.6
qwertyu0967 | 0.6
qwertyu0968 | 0.6
qwertyu0969 | 0.6
qwertyu0970 | 0.6
qwertyu0971 | 0.6
qwertyu0972 | 0.6
qwertyu0973 | 0.6
qwertyu0974 | 0.6
qwertyu0975 | 0.6
qwertyu0976 | 0.6
qwertyu0977 | 0.6
qwertyu0978 | 0.6
qwertyu0979 | 0.6
qwertyu0990 | 0.6
qwertyu0991 | 0.6
qwertyu0992 | 0.6
qwertyu0993 | 0.6
qwertyu0994 | 0.6
qwertyu0995 | 0.6
qwertyu0996 | 0.6
qwertyu0997 | 0.6
qwertyu0998 | 0.6
qwertyu0999 | 0.6
qwertyu0001 | 0.5
qwertyu0002 | 0.5
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qwertyu0696 | 0.5
qwertyu0697 | 0.5
qwertyu0698 | 0.5
qwertyu0699 | 0.5
qwertyu0700 | 0.5
qwertyu0701 | 0.5
qwertyu0702 | 0.5
qwertyu0703 | 0.5
qwertyu0704 | 0.5
qwertyu0705 | 0.5
qwertyu0706 | 0.5
qwertyu0707 | 0.5
qwertyu0708 | 0.5
qwertyu0709 | 0.5
qwertyu0710 | 0.5
qwertyu0711 | 0.5
qwertyu0712 | 0.5
qwertyu0713 | 0.5
qwertyu0714 | 0.5
qwertyu0715 | 0.5
qwertyu0716 | 0.5
qwertyu0717 | 0.5
qwertyu0718 | 0.5
qwertyu0719 | 0.5
qwertyu0720 | 0.5
qwertyu0721 | 0.5
qwertyu0722 | 0.5
qwertyu0723 | 0.5
qwertyu0724 | 0.5
qwertyu0725 | 0.5
qwertyu0726 | 0.5
qwertyu0727 | 0.5
qwertyu0728 | 0.5
qwertyu0729 | 0.5
qwertyu0730 | 0.5
qwertyu0731 | 0.5
qwertyu0732 | 0.5
qwertyu0733 | 0.5
qwertyu0734 | 0.5
qwertyu0735 | 0.5
qwertyu0736 | 0.5
qwertyu0737 | 0.5
qwertyu0738 | 0.5
qwertyu0739 | 0.5
qwertyu0740 | 0.5
qwertyu0741 | 0.5
qwertyu0742 | 0.5
qwertyu0743 | 0.5
qwertyu0744 | 0.5
qwertyu0745 | 0.5
qwertyu0746 | 0.5
qwertyu0747 | 0.5
qwertyu0748 | 0.5
qwertyu0749 | 0.5
qwertyu0750 | 0.5
qwertyu0751 | 0.5
qwertyu0752 | 0.5
qwertyu0753 | 0.5
qwertyu0754 | 0.5
qwertyu0755 | 0.5
qwertyu0756 | 0.5
qwertyu0757 | 0.5
qwertyu0758 | 0.5
qwertyu0759 | 0.5
qwertyu0760 | 0.5
qwertyu0761 | 0.5
qwertyu0762 | 0.5
qwertyu0763 | 0.5
qwertyu0764 | 0.5
qwertyu0765 | 0.5
qwertyu0766 | 0.5
qwertyu0767 | 0.5
qwertyu0768 | 0.5
qwertyu0769 | 0.5
qwertyu0770 | 0.5
qwertyu0771 | 0.5
qwertyu0772 | 0.5
qwertyu0773 | 0.5
qwertyu0774 | 0.5
qwertyu0775 | 0.5
qwertyu0776 | 0.5
qwertyu0777 | 0.5
qwertyu0778 | 0.5
qwertyu0779 | 0.5
qwertyu0780 | 0.5
qwertyu0781 | 0.5
qwertyu0782 | 0.5
qwertyu0783 | 0.5
qwertyu0784 | 0.5
qwertyu0785 | 0.5
qwertyu0786 | 0.5
qwertyu0787 | 0.5
qwertyu0789 | 0.5
qwertyu0790 | 0.5
qwertyu0791 | 0.5
qwertyu0792 | 0.5
qwertyu0793 | 0.5
qwertyu0794 | 0.5
qwertyu0795 | 0.5
qwertyu0796 | 0.5
qwertyu0797 | 0.5
qwertyu0798 | 0.5
qwertyu0799 | 0.5
qwertyu0800 | 0.5
qwertyu0801 | 0.5
qwertyu0802 | 0.5
qwertyu0803 | 0.5
qwertyu0804 | 0.5
qwertyu0805 | 0.5
qwertyu0806 | 0.5
qwertyu0807 | 0.5
qwertyu0808 | 0.5
qwertyu0809 | 0.5
qwertyu0810 | 0.5
qwertyu0811 | 0.5
qwertyu0812 | 0.5
qwertyu0813 | 0.5
qwertyu0814 | 0.5
qwertyu0815 | 0.5
qwertyu0816 | 0.5
qwertyu0817 | 0.5
qwertyu0818 | 0.5
qwertyu0819 | 0.5
qwertyu0820 | 0.5
qwertyu0821 | 0.5
qwertyu0822 | 0.5
qwertyu0823 | 0.5
qwertyu0824 | 0.5
qwertyu0825 | 0.5
qwertyu0826 | 0.5
qwertyu0827 | 0.5
qwertyu0828 | 0.5
qwertyu0829 | 0.5
qwertyu0830 | 0.5
qwertyu0831 | 0.5
qwertyu0832 | 0.5
qwertyu0833 | 0.5
qwertyu0834 | 0.5
qwertyu0835 | 0.5
qwertyu0836 | 0.5
qwertyu0837 | 0.5
qwertyu0838 | 0.5
qwertyu0839 | 0.5
qwertyu0840 | 0.5
qwertyu0841 | 0.5
qwertyu0842 | 0.5
qwertyu0843 | 0.5
qwertyu0844 | 0.5
qwertyu0845 | 0.5
qwertyu0846 | 0.5
qwertyu0847 | 0.5
qwertyu0848 | 0.5
qwertyu0849 | 0.5
qwertyu0850 | 0.5
qwertyu0851 | 0.5
qwertyu0852 | 0.5
qwertyu0853 | 0.5
qwertyu0854 | 0.5
qwertyu0855 | 0.5
qwertyu0856 | 0.5
qwertyu0857 | 0.5
qwertyu0858 | 0.5
qwertyu0859 | 0.5
qwertyu0860 | 0.5
qwertyu0861 | 0.5
qwertyu0862 | 0.5
qwertyu0863 | 0.5
qwertyu0864 | 0.5
qwertyu0865 | 0.5
qwertyu0866 | 0.5
qwertyu0867 | 0.5
qwertyu0868 | 0.5
qwertyu0869 | 0.5
qwertyu0870 | 0.5
qwertyu0871 | 0.5
qwertyu0872 | 0.5
qwertyu0873 | 0.5
qwertyu0874 | 0.5
qwertyu0875 | 0.5
qwertyu0876 | 0.5
qwertyu0877 | 0.5
qwertyu0878 | 0.5
qwertyu0879 | 0.5
qwertyu0880 | 0.5
qwertyu0881 | 0.5
qwertyu0882 | 0.5
qwertyu0883 | 0.5
qwertyu0884 | 0.5
qwertyu0885 | 0.5
qwertyu0886 | 0.5
qwertyu0887 | 0.5
qwertyu0889 | 0.5
qwertyu0890 | 0.5
qwertyu0891 | 0.5
qwertyu0892 | 0.5
qwertyu0893 | 0.5
qwertyu0894 | 0.5
qwertyu0895 | 0.5
qwertyu0896 | 0.5
qwertyu0897 | 0.5
qwertyu0898 | 0.5
qwertyu0899 | 0.5
qwertyu1000 | 0.411765
(1000 rows)
select t,similarity(t,'gwertyu0988') as sml from test_trgm where t % 'gwertyu0988' order by sml desc, t;
t | sml
-------------+----------
qwertyu0988 | 0.6
qwertyu0980 | 0.411765
qwertyu0981 | 0.411765
qwertyu0982 | 0.411765
qwertyu0983 | 0.411765
qwertyu0984 | 0.411765
qwertyu0985 | 0.411765
qwertyu0986 | 0.411765
qwertyu0987 | 0.411765
qwertyu0989 | 0.411765
qwertyu0088 | 0.333333
qwertyu0098 | 0.333333
qwertyu0188 | 0.333333
qwertyu0288 | 0.333333
qwertyu0388 | 0.333333
qwertyu0488 | 0.333333
qwertyu0588 | 0.333333
qwertyu0688 | 0.333333
qwertyu0788 | 0.333333
qwertyu0888 | 0.333333
qwertyu0900 | 0.333333
qwertyu0901 | 0.333333
qwertyu0902 | 0.333333
qwertyu0903 | 0.333333
qwertyu0904 | 0.333333
qwertyu0905 | 0.333333
qwertyu0906 | 0.333333
qwertyu0907 | 0.333333
qwertyu0908 | 0.333333
qwertyu0909 | 0.333333
qwertyu0910 | 0.333333
qwertyu0911 | 0.333333
qwertyu0912 | 0.333333
qwertyu0913 | 0.333333
qwertyu0914 | 0.333333
qwertyu0915 | 0.333333
qwertyu0916 | 0.333333
qwertyu0917 | 0.333333
qwertyu0918 | 0.333333
qwertyu0919 | 0.333333
qwertyu0920 | 0.333333
qwertyu0921 | 0.333333
qwertyu0922 | 0.333333
qwertyu0923 | 0.333333
qwertyu0924 | 0.333333
qwertyu0925 | 0.333333
qwertyu0926 | 0.333333
qwertyu0927 | 0.333333
qwertyu0928 | 0.333333
qwertyu0929 | 0.333333
qwertyu0930 | 0.333333
qwertyu0931 | 0.333333
qwertyu0932 | 0.333333
qwertyu0933 | 0.333333
qwertyu0934 | 0.333333
qwertyu0935 | 0.333333
qwertyu0936 | 0.333333
qwertyu0937 | 0.333333
qwertyu0938 | 0.333333
qwertyu0939 | 0.333333
qwertyu0940 | 0.333333
qwertyu0941 | 0.333333
qwertyu0942 | 0.333333
qwertyu0943 | 0.333333
qwertyu0944 | 0.333333
qwertyu0945 | 0.333333
qwertyu0946 | 0.333333
qwertyu0947 | 0.333333
qwertyu0948 | 0.333333
qwertyu0949 | 0.333333
qwertyu0950 | 0.333333
qwertyu0951 | 0.333333
qwertyu0952 | 0.333333
qwertyu0953 | 0.333333
qwertyu0954 | 0.333333
qwertyu0955 | 0.333333
qwertyu0956 | 0.333333
qwertyu0957 | 0.333333
qwertyu0958 | 0.333333
qwertyu0959 | 0.333333
qwertyu0960 | 0.333333
qwertyu0961 | 0.333333
qwertyu0962 | 0.333333
qwertyu0963 | 0.333333
qwertyu0964 | 0.333333
qwertyu0965 | 0.333333
qwertyu0966 | 0.333333
qwertyu0967 | 0.333333
qwertyu0968 | 0.333333
qwertyu0969 | 0.333333
qwertyu0970 | 0.333333
qwertyu0971 | 0.333333
qwertyu0972 | 0.333333
qwertyu0973 | 0.333333
qwertyu0974 | 0.333333
qwertyu0975 | 0.333333
qwertyu0976 | 0.333333
qwertyu0977 | 0.333333
qwertyu0978 | 0.333333
qwertyu0979 | 0.333333
qwertyu0990 | 0.333333
qwertyu0991 | 0.333333
qwertyu0992 | 0.333333
qwertyu0993 | 0.333333
qwertyu0994 | 0.333333
qwertyu0995 | 0.333333
qwertyu0996 | 0.333333
qwertyu0997 | 0.333333
qwertyu0998 | 0.333333
qwertyu0999 | 0.333333
(110 rows)
select t,similarity(t,'gwertyu1988') as sml from test_trgm where t % 'gwertyu1988' order by sml desc, t;
t | sml
-------------+----------
qwertyu0988 | 0.333333
(1 row)
explain (costs off)
select t <-> 'q0987wertyu0988', t from test_trgm order by t <-> 'q0987wertyu0988' limit 2;
QUERY PLAN
---------------------------------------------------
Limit
-> Index Scan using trgm_idx on test_trgm
Order By: (t <-> 'q0987wertyu0988'::text)
(3 rows)
select t <-> 'q0987wertyu0988', t from test_trgm order by t <-> 'q0987wertyu0988' limit 2;
?column? | t
----------+-------------
0.411765 | qwertyu0988
0.5 | qwertyu0987
(2 rows)
select count(*) from test_trgm where t ~ '[qwerty]{2}-?[qwerty]{2}';
count
-------
1000
(1 row)
drop index trgm_idx;
create index trgm_idx on test_trgm using gin (t gin_trgm_ops);
set enable_seqscan=off;
select t,similarity(t,'qwertyu0988') as sml from test_trgm where t % 'qwertyu0988' order by sml desc, t;
t | sml
-------------+----------
qwertyu0988 | 1
qwertyu0980 | 0.714286
qwertyu0981 | 0.714286
qwertyu0982 | 0.714286
qwertyu0983 | 0.714286
qwertyu0984 | 0.714286
qwertyu0985 | 0.714286
qwertyu0986 | 0.714286
qwertyu0987 | 0.714286
qwertyu0989 | 0.714286
qwertyu0088 | 0.6
qwertyu0098 | 0.6
qwertyu0188 | 0.6
qwertyu0288 | 0.6
qwertyu0388 | 0.6
qwertyu0488 | 0.6
qwertyu0588 | 0.6
qwertyu0688 | 0.6
qwertyu0788 | 0.6
qwertyu0888 | 0.6
qwertyu0900 | 0.6
qwertyu0901 | 0.6
qwertyu0902 | 0.6
qwertyu0903 | 0.6
qwertyu0904 | 0.6
qwertyu0905 | 0.6
qwertyu0906 | 0.6
qwertyu0907 | 0.6
qwertyu0908 | 0.6
qwertyu0909 | 0.6
qwertyu0910 | 0.6
qwertyu0911 | 0.6
qwertyu0912 | 0.6
qwertyu0913 | 0.6
qwertyu0914 | 0.6
qwertyu0915 | 0.6
qwertyu0916 | 0.6
qwertyu0917 | 0.6
qwertyu0918 | 0.6
qwertyu0919 | 0.6
qwertyu0920 | 0.6
qwertyu0921 | 0.6
qwertyu0922 | 0.6
qwertyu0923 | 0.6
qwertyu0924 | 0.6
qwertyu0925 | 0.6
qwertyu0926 | 0.6
qwertyu0927 | 0.6
qwertyu0928 | 0.6
qwertyu0929 | 0.6
qwertyu0930 | 0.6
qwertyu0931 | 0.6
qwertyu0932 | 0.6
qwertyu0933 | 0.6
qwertyu0934 | 0.6
qwertyu0935 | 0.6
qwertyu0936 | 0.6
qwertyu0937 | 0.6
qwertyu0938 | 0.6
qwertyu0939 | 0.6
qwertyu0940 | 0.6
qwertyu0941 | 0.6
qwertyu0942 | 0.6
qwertyu0943 | 0.6
qwertyu0944 | 0.6
qwertyu0945 | 0.6
qwertyu0946 | 0.6
qwertyu0947 | 0.6
qwertyu0948 | 0.6
qwertyu0949 | 0.6
qwertyu0950 | 0.6
qwertyu0951 | 0.6
qwertyu0952 | 0.6
qwertyu0953 | 0.6
qwertyu0954 | 0.6
qwertyu0955 | 0.6
qwertyu0956 | 0.6
qwertyu0957 | 0.6
qwertyu0958 | 0.6
qwertyu0959 | 0.6
qwertyu0960 | 0.6
qwertyu0961 | 0.6
qwertyu0962 | 0.6
qwertyu0963 | 0.6
qwertyu0964 | 0.6
qwertyu0965 | 0.6
qwertyu0966 | 0.6
qwertyu0967 | 0.6
qwertyu0968 | 0.6
qwertyu0969 | 0.6
qwertyu0970 | 0.6
qwertyu0971 | 0.6
qwertyu0972 | 0.6
qwertyu0973 | 0.6
qwertyu0974 | 0.6
qwertyu0975 | 0.6
qwertyu0976 | 0.6
qwertyu0977 | 0.6
qwertyu0978 | 0.6
qwertyu0979 | 0.6
qwertyu0990 | 0.6
qwertyu0991 | 0.6
qwertyu0992 | 0.6
qwertyu0993 | 0.6
qwertyu0994 | 0.6
qwertyu0995 | 0.6
qwertyu0996 | 0.6
qwertyu0997 | 0.6
qwertyu0998 | 0.6
qwertyu0999 | 0.6
qwertyu0001 | 0.5
qwertyu0002 | 0.5
qwertyu0003 | 0.5
qwertyu0004 | 0.5
qwertyu0005 | 0.5
qwertyu0006 | 0.5
qwertyu0007 | 0.5
qwertyu0008 | 0.5
qwertyu0009 | 0.5
qwertyu0010 | 0.5
qwertyu0011 | 0.5
qwertyu0012 | 0.5
qwertyu0013 | 0.5
qwertyu0014 | 0.5
qwertyu0015 | 0.5
qwertyu0016 | 0.5
qwertyu0017 | 0.5
qwertyu0018 | 0.5
qwertyu0019 | 0.5
qwertyu0020 | 0.5
qwertyu0021 | 0.5
qwertyu0022 | 0.5
qwertyu0023 | 0.5
qwertyu0024 | 0.5
qwertyu0025 | 0.5
qwertyu0026 | 0.5
qwertyu0027 | 0.5
qwertyu0028 | 0.5
qwertyu0029 | 0.5
qwertyu0030 | 0.5
qwertyu0031 | 0.5
qwertyu0032 | 0.5
qwertyu0033 | 0.5
qwertyu0034 | 0.5
qwertyu0035 | 0.5
qwertyu0036 | 0.5
qwertyu0037 | 0.5
qwertyu0038 | 0.5
qwertyu0039 | 0.5
qwertyu0040 | 0.5
qwertyu0041 | 0.5
qwertyu0042 | 0.5
qwertyu0043 | 0.5
qwertyu0044 | 0.5
qwertyu0045 | 0.5
qwertyu0046 | 0.5
qwertyu0047 | 0.5
qwertyu0048 | 0.5
qwertyu0049 | 0.5
qwertyu0050 | 0.5
qwertyu0051 | 0.5
qwertyu0052 | 0.5
qwertyu0053 | 0.5
qwertyu0054 | 0.5
qwertyu0055 | 0.5
qwertyu0056 | 0.5
qwertyu0057 | 0.5
qwertyu0058 | 0.5
qwertyu0059 | 0.5
qwertyu0060 | 0.5
qwertyu0061 | 0.5
qwertyu0062 | 0.5
qwertyu0063 | 0.5
qwertyu0064 | 0.5
qwertyu0065 | 0.5
qwertyu0066 | 0.5
qwertyu0067 | 0.5
qwertyu0068 | 0.5
qwertyu0069 | 0.5
qwertyu0070 | 0.5
qwertyu0071 | 0.5
qwertyu0072 | 0.5
qwertyu0073 | 0.5
qwertyu0074 | 0.5
qwertyu0075 | 0.5
qwertyu0076 | 0.5
qwertyu0077 | 0.5
qwertyu0078 | 0.5
qwertyu0079 | 0.5
qwertyu0080 | 0.5
qwertyu0081 | 0.5
qwertyu0082 | 0.5
qwertyu0083 | 0.5
qwertyu0084 | 0.5
qwertyu0085 | 0.5
qwertyu0086 | 0.5
qwertyu0087 | 0.5
qwertyu0089 | 0.5
qwertyu0090 | 0.5
qwertyu0091 | 0.5
qwertyu0092 | 0.5
qwertyu0093 | 0.5
qwertyu0094 | 0.5
qwertyu0095 | 0.5
qwertyu0096 | 0.5
qwertyu0097 | 0.5
qwertyu0099 | 0.5
qwertyu0100 | 0.5
qwertyu0101 | 0.5
qwertyu0102 | 0.5
qwertyu0103 | 0.5
qwertyu0104 | 0.5
qwertyu0105 | 0.5
qwertyu0106 | 0.5
qwertyu0107 | 0.5
qwertyu0108 | 0.5
qwertyu0109 | 0.5
qwertyu0110 | 0.5
qwertyu0111 | 0.5
qwertyu0112 | 0.5
qwertyu0113 | 0.5
qwertyu0114 | 0.5
qwertyu0115 | 0.5
qwertyu0116 | 0.5
qwertyu0117 | 0.5
qwertyu0118 | 0.5
qwertyu0119 | 0.5
qwertyu0120 | 0.5
qwertyu0121 | 0.5
qwertyu0122 | 0.5
qwertyu0123 | 0.5
qwertyu0124 | 0.5
qwertyu0125 | 0.5
qwertyu0126 | 0.5
qwertyu0127 | 0.5
qwertyu0128 | 0.5
qwertyu0129 | 0.5
qwertyu0130 | 0.5
qwertyu0131 | 0.5
qwertyu0132 | 0.5
qwertyu0133 | 0.5
qwertyu0134 | 0.5
qwertyu0135 | 0.5
qwertyu0136 | 0.5
qwertyu0137 | 0.5
qwertyu0138 | 0.5
qwertyu0139 | 0.5
qwertyu0140 | 0.5
qwertyu0141 | 0.5
qwertyu0142 | 0.5
qwertyu0143 | 0.5
qwertyu0144 | 0.5
qwertyu0145 | 0.5
qwertyu0146 | 0.5
qwertyu0147 | 0.5
qwertyu0148 | 0.5
qwertyu0149 | 0.5
qwertyu0150 | 0.5
qwertyu0151 | 0.5
qwertyu0152 | 0.5
qwertyu0153 | 0.5
qwertyu0154 | 0.5
qwertyu0155 | 0.5
qwertyu0156 | 0.5
qwertyu0157 | 0.5
qwertyu0158 | 0.5
qwertyu0159 | 0.5
qwertyu0160 | 0.5
qwertyu0161 | 0.5
qwertyu0162 | 0.5
qwertyu0163 | 0.5
qwertyu0164 | 0.5
qwertyu0165 | 0.5
qwertyu0166 | 0.5
qwertyu0167 | 0.5
qwertyu0168 | 0.5
qwertyu0169 | 0.5
qwertyu0170 | 0.5
qwertyu0171 | 0.5
qwertyu0172 | 0.5
qwertyu0173 | 0.5
qwertyu0174 | 0.5
qwertyu0175 | 0.5
qwertyu0176 | 0.5
qwertyu0177 | 0.5
qwertyu0178 | 0.5
qwertyu0179 | 0.5
qwertyu0180 | 0.5
qwertyu0181 | 0.5
qwertyu0182 | 0.5
qwertyu0183 | 0.5
qwertyu0184 | 0.5
qwertyu0185 | 0.5
qwertyu0186 | 0.5
qwertyu0187 | 0.5
qwertyu0189 | 0.5
qwertyu0190 | 0.5
qwertyu0191 | 0.5
qwertyu0192 | 0.5
qwertyu0193 | 0.5
qwertyu0194 | 0.5
qwertyu0195 | 0.5
qwertyu0196 | 0.5
qwertyu0197 | 0.5
qwertyu0198 | 0.5
qwertyu0199 | 0.5
qwertyu0200 | 0.5
qwertyu0201 | 0.5
qwertyu0202 | 0.5
qwertyu0203 | 0.5
qwertyu0204 | 0.5
qwertyu0205 | 0.5
qwertyu0206 | 0.5
qwertyu0207 | 0.5
qwertyu0208 | 0.5
qwertyu0209 | 0.5
qwertyu0210 | 0.5
qwertyu0211 | 0.5
qwertyu0212 | 0.5
qwertyu0213 | 0.5
qwertyu0214 | 0.5
qwertyu0215 | 0.5
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qwertyu1000 | 0.411765
(1000 rows)
select t,similarity(t,'gwertyu0988') as sml from test_trgm where t % 'gwertyu0988' order by sml desc, t;
t | sml
-------------+----------
qwertyu0988 | 0.6
qwertyu0980 | 0.411765
qwertyu0981 | 0.411765
qwertyu0982 | 0.411765
qwertyu0983 | 0.411765
qwertyu0984 | 0.411765
qwertyu0985 | 0.411765
qwertyu0986 | 0.411765
qwertyu0987 | 0.411765
qwertyu0989 | 0.411765
qwertyu0088 | 0.333333
qwertyu0098 | 0.333333
qwertyu0188 | 0.333333
qwertyu0288 | 0.333333
qwertyu0388 | 0.333333
qwertyu0488 | 0.333333
qwertyu0588 | 0.333333
qwertyu0688 | 0.333333
qwertyu0788 | 0.333333
qwertyu0888 | 0.333333
qwertyu0900 | 0.333333
qwertyu0901 | 0.333333
qwertyu0902 | 0.333333
qwertyu0903 | 0.333333
qwertyu0904 | 0.333333
qwertyu0905 | 0.333333
qwertyu0906 | 0.333333
qwertyu0907 | 0.333333
qwertyu0908 | 0.333333
qwertyu0909 | 0.333333
qwertyu0910 | 0.333333
qwertyu0911 | 0.333333
qwertyu0912 | 0.333333
qwertyu0913 | 0.333333
qwertyu0914 | 0.333333
qwertyu0915 | 0.333333
qwertyu0916 | 0.333333
qwertyu0917 | 0.333333
qwertyu0918 | 0.333333
qwertyu0919 | 0.333333
qwertyu0920 | 0.333333
qwertyu0921 | 0.333333
qwertyu0922 | 0.333333
qwertyu0923 | 0.333333
qwertyu0924 | 0.333333
qwertyu0925 | 0.333333
qwertyu0926 | 0.333333
qwertyu0927 | 0.333333
qwertyu0928 | 0.333333
qwertyu0929 | 0.333333
qwertyu0930 | 0.333333
qwertyu0931 | 0.333333
qwertyu0932 | 0.333333
qwertyu0933 | 0.333333
qwertyu0934 | 0.333333
qwertyu0935 | 0.333333
qwertyu0936 | 0.333333
qwertyu0937 | 0.333333
qwertyu0938 | 0.333333
qwertyu0939 | 0.333333
qwertyu0940 | 0.333333
qwertyu0941 | 0.333333
qwertyu0942 | 0.333333
qwertyu0943 | 0.333333
qwertyu0944 | 0.333333
qwertyu0945 | 0.333333
qwertyu0946 | 0.333333
qwertyu0947 | 0.333333
qwertyu0948 | 0.333333
qwertyu0949 | 0.333333
qwertyu0950 | 0.333333
qwertyu0951 | 0.333333
qwertyu0952 | 0.333333
qwertyu0953 | 0.333333
qwertyu0954 | 0.333333
qwertyu0955 | 0.333333
qwertyu0956 | 0.333333
qwertyu0957 | 0.333333
qwertyu0958 | 0.333333
qwertyu0959 | 0.333333
qwertyu0960 | 0.333333
qwertyu0961 | 0.333333
qwertyu0962 | 0.333333
qwertyu0963 | 0.333333
qwertyu0964 | 0.333333
qwertyu0965 | 0.333333
qwertyu0966 | 0.333333
qwertyu0967 | 0.333333
qwertyu0968 | 0.333333
qwertyu0969 | 0.333333
qwertyu0970 | 0.333333
qwertyu0971 | 0.333333
qwertyu0972 | 0.333333
qwertyu0973 | 0.333333
qwertyu0974 | 0.333333
qwertyu0975 | 0.333333
qwertyu0976 | 0.333333
qwertyu0977 | 0.333333
qwertyu0978 | 0.333333
qwertyu0979 | 0.333333
qwertyu0990 | 0.333333
qwertyu0991 | 0.333333
qwertyu0992 | 0.333333
qwertyu0993 | 0.333333
qwertyu0994 | 0.333333
qwertyu0995 | 0.333333
qwertyu0996 | 0.333333
qwertyu0997 | 0.333333
qwertyu0998 | 0.333333
qwertyu0999 | 0.333333
(110 rows)
select t,similarity(t,'gwertyu1988') as sml from test_trgm where t % 'gwertyu1988' order by sml desc, t;
t | sml
-------------+----------
qwertyu0988 | 0.333333
(1 row)
select count(*) from test_trgm where t ~ '[qwerty]{2}-?[qwerty]{2}';
count
-------
1000
(1 row)
-- check handling of indexquals that generate no searchable conditions
explain (costs off)
select count(*) from test_trgm where t like '%99%' and t like '%qwerty%';
QUERY PLAN
-----------------------------------------------------------------------------
Aggregate
-> Bitmap Heap Scan on test_trgm
Recheck Cond: ((t ~~ '%99%'::text) AND (t ~~ '%qwerty%'::text))
-> Bitmap Index Scan on trgm_idx
Index Cond: ((t ~~ '%99%'::text) AND (t ~~ '%qwerty%'::text))
(5 rows)
select count(*) from test_trgm where t like '%99%' and t like '%qwerty%';
count
-------
19
(1 row)
explain (costs off)
select count(*) from test_trgm where t like '%99%' and t like '%qw%';
QUERY PLAN
-------------------------------------------------------------------------
Aggregate
-> Bitmap Heap Scan on test_trgm
Recheck Cond: ((t ~~ '%99%'::text) AND (t ~~ '%qw%'::text))
-> Bitmap Index Scan on trgm_idx
Index Cond: ((t ~~ '%99%'::text) AND (t ~~ '%qw%'::text))
(5 rows)
select count(*) from test_trgm where t like '%99%' and t like '%qw%';
count
-------
19
(1 row)
-- ensure that pending-list items are handled correctly, too
create temp table t_test_trgm(t text COLLATE "C");
create index t_trgm_idx on t_test_trgm using gin (t gin_trgm_ops);
insert into t_test_trgm values ('qwerty99'), ('qwerty01');
explain (costs off)
select count(*) from t_test_trgm where t like '%99%' and t like '%qwerty%';
QUERY PLAN
-----------------------------------------------------------------------------
Aggregate
-> Bitmap Heap Scan on t_test_trgm
Recheck Cond: ((t ~~ '%99%'::text) AND (t ~~ '%qwerty%'::text))
-> Bitmap Index Scan on t_trgm_idx
Index Cond: ((t ~~ '%99%'::text) AND (t ~~ '%qwerty%'::text))
(5 rows)
select count(*) from t_test_trgm where t like '%99%' and t like '%qwerty%';
count
-------
1
(1 row)
explain (costs off)
select count(*) from t_test_trgm where t like '%99%' and t like '%qw%';
QUERY PLAN
-------------------------------------------------------------------------
Aggregate
-> Bitmap Heap Scan on t_test_trgm
Recheck Cond: ((t ~~ '%99%'::text) AND (t ~~ '%qw%'::text))
-> Bitmap Index Scan on t_trgm_idx
Index Cond: ((t ~~ '%99%'::text) AND (t ~~ '%qw%'::text))
(5 rows)
select count(*) from t_test_trgm where t like '%99%' and t like '%qw%';
count
-------
1
(1 row)
-- run the same queries with sequential scan to check the results
set enable_bitmapscan=off;
set enable_seqscan=on;
select count(*) from test_trgm where t like '%99%' and t like '%qwerty%';
count
-------
19
(1 row)
select count(*) from test_trgm where t like '%99%' and t like '%qw%';
count
-------
19
(1 row)
select count(*) from t_test_trgm where t like '%99%' and t like '%qwerty%';
count
-------
1
(1 row)
select count(*) from t_test_trgm where t like '%99%' and t like '%qw%';
count
-------
1
(1 row)
reset enable_bitmapscan;
create table test2(t text COLLATE "C");
insert into test2 values ('abcdef');
insert into test2 values ('quark');
insert into test2 values (' z foo bar');
insert into test2 values ('/123/-45/');
create index test2_idx_gin on test2 using gin (t gin_trgm_ops);
set enable_seqscan=off;
explain (costs off)
select * from test2 where t like '%BCD%';
QUERY PLAN
------------------------------------------
Bitmap Heap Scan on test2
Recheck Cond: (t ~~ '%BCD%'::text)
-> Bitmap Index Scan on test2_idx_gin
Index Cond: (t ~~ '%BCD%'::text)
(4 rows)
explain (costs off)
select * from test2 where t ilike '%BCD%';
QUERY PLAN
-------------------------------------------
Bitmap Heap Scan on test2
Recheck Cond: (t ~~* '%BCD%'::text)
-> Bitmap Index Scan on test2_idx_gin
Index Cond: (t ~~* '%BCD%'::text)
(4 rows)
select * from test2 where t like '%BCD%';
t
---
(0 rows)
select * from test2 where t like '%bcd%';
t
--------
abcdef
(1 row)
select * from test2 where t like E'%\\bcd%';
t
--------
abcdef
(1 row)
select * from test2 where t ilike '%BCD%';
t
--------
abcdef
(1 row)
select * from test2 where t ilike 'qua%';
t
-------
quark
(1 row)
select * from test2 where t like '%z foo bar%';
t
-------------
z foo bar
(1 row)
select * from test2 where t like ' z foo%';
t
-------------
z foo bar
(1 row)
explain (costs off)
select * from test2 where t ~ '[abc]{3}';
QUERY PLAN
--------------------------------------------
Bitmap Heap Scan on test2
Recheck Cond: (t ~ '[abc]{3}'::text)
-> Bitmap Index Scan on test2_idx_gin
Index Cond: (t ~ '[abc]{3}'::text)
(4 rows)
explain (costs off)
select * from test2 where t ~* 'DEF';
QUERY PLAN
------------------------------------------
Bitmap Heap Scan on test2
Recheck Cond: (t ~* 'DEF'::text)
-> Bitmap Index Scan on test2_idx_gin
Index Cond: (t ~* 'DEF'::text)
(4 rows)
select * from test2 where t ~ '[abc]{3}';
t
--------
abcdef
(1 row)
select * from test2 where t ~ 'a[bc]+d';
t
--------
abcdef
(1 row)
select * from test2 where t ~ '(abc)*$';
t
-------------
abcdef
quark
z foo bar
/123/-45/
(4 rows)
select * from test2 where t ~* 'DEF';
t
--------
abcdef
(1 row)
select * from test2 where t ~ 'dEf';
t
---
(0 rows)
select * from test2 where t ~* '^q';
t
-------
quark
(1 row)
select * from test2 where t ~* '[abc]{3}[def]{3}';
t
--------
abcdef
(1 row)
select * from test2 where t ~* 'ab[a-z]{3}';
t
--------
abcdef
(1 row)
select * from test2 where t ~* '(^| )qua';
t
-------
quark
(1 row)
select * from test2 where t ~ 'q.*rk$';
t
-------
quark
(1 row)
select * from test2 where t ~ 'q';
t
-------
quark
(1 row)
select * from test2 where t ~ '[a-z]{3}';
t
-------------
abcdef
quark
z foo bar
(3 rows)
select * from test2 where t ~* '(a{10}|b{10}|c{10}){10}';
t
---
(0 rows)
select * from test2 where t ~ 'z foo bar';
t
-------------
z foo bar
(1 row)
select * from test2 where t ~ ' z foo bar';
t
-------------
z foo bar
(1 row)
select * from test2 where t ~ ' z foo bar';
t
-------------
z foo bar
(1 row)
select * from test2 where t ~ ' z foo';
t
-------------
z foo bar
(1 row)
select * from test2 where t ~ 'qua(?!foo)';
t
-------
quark
(1 row)
select * from test2 where t ~ '/\d+/-\d';
t
-----------
/123/-45/
(1 row)
drop index test2_idx_gin;
create index test2_idx_gist on test2 using gist (t gist_trgm_ops);
set enable_seqscan=off;
explain (costs off)
select * from test2 where t like '%BCD%';
QUERY PLAN
------------------------------------------
Index Scan using test2_idx_gist on test2
Index Cond: (t ~~ '%BCD%'::text)
(2 rows)
explain (costs off)
select * from test2 where t ilike '%BCD%';
QUERY PLAN
------------------------------------------
Index Scan using test2_idx_gist on test2
Index Cond: (t ~~* '%BCD%'::text)
(2 rows)
select * from test2 where t like '%BCD%';
t
---
(0 rows)
select * from test2 where t like '%bcd%';
t
--------
abcdef
(1 row)
select * from test2 where t like E'%\\bcd%';
t
--------
abcdef
(1 row)
select * from test2 where t ilike '%BCD%';
t
--------
abcdef
(1 row)
select * from test2 where t ilike 'qua%';
t
-------
quark
(1 row)
select * from test2 where t like '%z foo bar%';
t
-------------
z foo bar
(1 row)
select * from test2 where t like ' z foo%';
t
-------------
z foo bar
(1 row)
explain (costs off)
select * from test2 where t ~ '[abc]{3}';
QUERY PLAN
------------------------------------------
Index Scan using test2_idx_gist on test2
Index Cond: (t ~ '[abc]{3}'::text)
(2 rows)
explain (costs off)
select * from test2 where t ~* 'DEF';
QUERY PLAN
------------------------------------------
Index Scan using test2_idx_gist on test2
Index Cond: (t ~* 'DEF'::text)
(2 rows)
select * from test2 where t ~ '[abc]{3}';
t
--------
abcdef
(1 row)
select * from test2 where t ~ 'a[bc]+d';
t
--------
abcdef
(1 row)
select * from test2 where t ~ '(abc)*$';
t
-------------
abcdef
quark
z foo bar
/123/-45/
(4 rows)
select * from test2 where t ~* 'DEF';
t
--------
abcdef
(1 row)
select * from test2 where t ~ 'dEf';
t
---
(0 rows)
select * from test2 where t ~* '^q';
t
-------
quark
(1 row)
select * from test2 where t ~* '[abc]{3}[def]{3}';
t
--------
abcdef
(1 row)
select * from test2 where t ~* 'ab[a-z]{3}';
t
--------
abcdef
(1 row)
select * from test2 where t ~* '(^| )qua';
t
-------
quark
(1 row)
select * from test2 where t ~ 'q.*rk$';
t
-------
quark
(1 row)
select * from test2 where t ~ 'q';
t
-------
quark
(1 row)
select * from test2 where t ~ '[a-z]{3}';
t
-------------
abcdef
quark
z foo bar
(3 rows)
select * from test2 where t ~* '(a{10}|b{10}|c{10}){10}';
t
---
(0 rows)
select * from test2 where t ~ 'z foo bar';
t
-------------
z foo bar
(1 row)
select * from test2 where t ~ ' z foo bar';
t
-------------
z foo bar
(1 row)
select * from test2 where t ~ ' z foo bar';
t
-------------
z foo bar
(1 row)
select * from test2 where t ~ ' z foo';
t
-------------
z foo bar
(1 row)
select * from test2 where t ~ 'qua(?!foo)';
t
-------
quark
(1 row)
select * from test2 where t ~ '/\d+/-\d';
t
-----------
/123/-45/
(1 row)
-- Check similarity threshold (bug #14202)
CREATE TEMP TABLE restaurants (city text);
INSERT INTO restaurants SELECT 'Warsaw' FROM generate_series(1, 10000);
INSERT INTO restaurants SELECT 'Szczecin' FROM generate_series(1, 10000);
CREATE INDEX ON restaurants USING gist(city gist_trgm_ops);
-- Similarity of the two names (for reference).
SELECT similarity('Szczecin', 'Warsaw');
similarity
------------
0
(1 row)
-- Should get only 'Warsaw' for either setting of set_limit.
EXPLAIN (COSTS OFF)
SELECT DISTINCT city, similarity(city, 'Warsaw'), show_limit()
FROM restaurants WHERE city % 'Warsaw';
QUERY PLAN
-------------------------------------------------------------
Unique
-> Sort
Sort Key: city, (similarity(city, 'Warsaw'::text))
-> Bitmap Heap Scan on restaurants
Recheck Cond: (city % 'Warsaw'::text)
-> Bitmap Index Scan on restaurants_city_idx
Index Cond: (city % 'Warsaw'::text)
(7 rows)
SELECT set_limit(0.3);
set_limit
-----------
0.3
(1 row)
SELECT DISTINCT city, similarity(city, 'Warsaw'), show_limit()
FROM restaurants WHERE city % 'Warsaw';
city | similarity | show_limit
--------+------------+------------
Warsaw | 1 | 0.3
(1 row)
SELECT set_limit(0.5);
set_limit
-----------
0.5
(1 row)
SELECT DISTINCT city, similarity(city, 'Warsaw'), show_limit()
FROM restaurants WHERE city % 'Warsaw';
city | similarity | show_limit
--------+------------+------------
Warsaw | 1 | 0.5
(1 row)
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