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postgresql/src/backend/parser
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Tomas Vondra b822ae13ea Use lfirst_int in cmp_list_len_contents_asc 
The function added in be45be9c33 is comparing integer lists (IntList) by
length and contents, but there were two bugs.  Firstly, it used intVal()
to extract the value, but that's for Value nodes, not for extracting int
values from IntList.  Secondly, it called it directly on the ListCell,
without doing lfirst().  So just do lfirst_int() instead.

Interestingly enough, this did not cause any crashes on the buildfarm,
but valgrind rightfully complained about it.

Discussion: https://postgr.es/m/bf3805a8-d7d1-ae61-fece-761b7ff41ecc@postgresfriends.org
 		2021-03-20 00:04:25 +01:00
..
.gitignore Convert cvsignore to gitignore, and add .gitignore for build targets. 2010-09-22 12:57:04 +02:00
Makefile Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
README Move keywords.c/kwlookup.c into src/common/. 2016-03-23 20:22:08 -04:00
analyze.c Implement GROUP BY DISTINCT 2021-03-18 18:22:18 +01:00
check_keywords.pl Update copyright for 2021 2021-01-02 13:06:25 -05:00
gram.y Allow configurable LZ4 TOAST compression. 2021-03-19 15:10:38 -04:00
parse_agg.c Use lfirst_int in cmp_list_len_contents_asc 2021-03-20 00:04:25 +01:00
parse_clause.c Remove no-longer-used RTE argument of markVarForSelectPriv(). 2021-02-11 11:23:25 -05:00
parse_coerce.c Re-implement pl/pgsql's expression and assignment parsing. 2021-01-04 11:52:00 -05:00
parse_collate.c Update copyright for 2021 2021-01-02 13:06:25 -05:00
parse_cte.c Fix list-manipulation bug in WITH RECURSIVE processing. 2021-02-25 20:47:32 -05:00
parse_enr.c Update copyright for 2021 2021-01-02 13:06:25 -05:00
parse_expr.c Remove no-longer-used RTE argument of markVarForSelectPriv(). 2021-02-11 11:23:25 -05:00
parse_func.c SEARCH and CYCLE clauses 2021-02-01 14:32:51 +01:00
parse_node.c Update copyright for 2021 2021-01-02 13:06:25 -05:00
parse_oper.c Update copyright for 2021 2021-01-02 13:06:25 -05:00
parse_param.c Update copyright for 2021 2021-01-02 13:06:25 -05:00
parse_relation.c Remove no-longer-used RTE argument of markVarForSelectPriv(). 2021-02-11 11:23:25 -05:00
parse_target.c Remove no-longer-used RTE argument of markVarForSelectPriv(). 2021-02-11 11:23:25 -05:00
parse_type.c Add the ability for the core grammar to have more than one parse target. 2021-01-04 11:03:22 -05:00
parse_utilcmd.c Allow configurable LZ4 TOAST compression. 2021-03-19 15:10:38 -04:00
parser.c Re-implement pl/pgsql's expression and assignment parsing. 2021-01-04 11:52:00 -05:00
scan.l Update copyright for 2021 2021-01-02 13:06:25 -05:00
scansup.c Update copyright for 2021 2021-01-02 13:06:25 -05:00

README 

src/backend/parser/README

Parser
======

This directory does more than tokenize and parse SQL queries.  It also
creates Query structures for the various complex queries that are passed
to the optimizer and then executor.

parser.c	things start here
scan.l		break query into tokens
scansup.c	handle escapes in input strings
gram.y		parse the tokens and produce a "raw" parse tree
analyze.c	top level of parse analysis for optimizable queries
parse_agg.c	handle aggregates, like SUM(col1),  AVG(col2), ...
parse_clause.c	handle clauses like WHERE, ORDER BY, GROUP BY, ...
parse_coerce.c	handle coercing expressions to different data types
parse_collate.c	assign collation information in completed expressions
parse_cte.c	handle Common Table Expressions (WITH clauses)
parse_expr.c	handle expressions like col, col + 3, x = 3 or x = 4
parse_func.c	handle functions, table.column and column identifiers
parse_node.c	create nodes for various structures
parse_oper.c	handle operators in expressions
parse_param.c	handle Params (for the cases used in the core backend)
parse_relation.c support routines for tables and column handling
parse_target.c	handle the result list of the query
parse_type.c	support routines for data type handling
parse_utilcmd.c	parse analysis for utility commands (done at execution time)

See also src/common/keywords.c, which contains the table of standard
keywords and the keyword lookup function.  We separated that out because
various frontend code wants to use it too.