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Fix IF NOT EXISTS in CREATE STATISTICS 

I misplaced the IF NOT EXISTS clause in commit 7b504eb282, before the
word STATISTICS.  Put it where it belongs.

Patch written independently by Amit Langote and myself.  I adopted his
submitted test case with a slight edit also.

Reported-by: Bruno Wolff III
Discussion: https://postgr.es/m/20170621004237.GB8337@wolff.to
This commit is contained in:
Alvaro Herrera 2017-06-22 13:17:08 -04:00
parent 2c77903b2b
commit 5dfd564b10
3 changed files with 25 additions and 11 deletions
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25
src/backend/parser/gram.y
View File

@ -3834,7 +3834,7 @@ ExistingIndex: USING INDEX index_name { $$ = $3; }
/*****************************************************************************
*
* QUERY :
* CREATE STATISTICS stats_name [(stat types)]
* CREATE STATISTICS [IF NOT EXISTS] stats_name [(stat types)]
* ON expression-list FROM from_list
*
* Note: the expectation here is that the clauses after ON are a subset of
@ -3846,15 +3846,26 @@ ExistingIndex: USING INDEX index_name { $$ = $3; }
*****************************************************************************/
CreateStatsStmt:
CREATE opt_if_not_exists STATISTICS any_name
CREATE STATISTICS any_name
opt_name_list ON expr_list FROM from_list
{
CreateStatsStmt *n = makeNode(CreateStatsStmt);
n->defnames = $4;
n->stat_types = $5;
n->exprs = $7;
n->relations = $9;
n->if_not_exists = $2;
n->defnames = $3;
n->stat_types = $4;
n->exprs = $6;
n->relations = $8;
n->if_not_exists = false;
$$ = (Node *)n;
}
| CREATE STATISTICS IF_P NOT EXISTS any_name
opt_name_list ON expr_list FROM from_list
{
CreateStatsStmt *n = makeNode(CreateStatsStmt);
n->defnames = $6;
n->stat_types = $7;
n->exprs = $9;
n->relations = $11;
n->if_not_exists = true;
$$ = (Node *)n;
}
;

6
src/test/regress/expected/stats_ext.out
View File

@ -30,9 +30,11 @@ CREATE STATISTICS tst ON (relpages, reltuples) FROM pg_class;
ERROR: only simple column references are allowed in CREATE STATISTICS
CREATE STATISTICS tst (unrecognized) ON relname, relnatts FROM pg_class;
ERROR: unrecognized statistic type "unrecognized"
-- Ensure stats are dropped sanely
-- Ensure stats are dropped sanely, and test IF NOT EXISTS while at it
CREATE TABLE ab1 (a INTEGER, b INTEGER, c INTEGER);
CREATE STATISTICS ab1_a_b_stats ON a, b FROM ab1;
CREATE STATISTICS IF NOT EXISTS ab1_a_b_stats ON a, b FROM ab1;
CREATE STATISTICS IF NOT EXISTS ab1_a_b_stats ON a, b FROM ab1;
NOTICE: statistics object "ab1_a_b_stats" already exists, skipping
DROP STATISTICS ab1_a_b_stats;
CREATE SCHEMA regress_schema_2;
CREATE STATISTICS regress_schema_2.ab1_a_b_stats ON a, b FROM ab1;

5
src/test/regress/sql/stats_ext.sql
View File

@ -18,9 +18,10 @@ CREATE STATISTICS tst ON relnatts + relpages FROM pg_class;
CREATE STATISTICS tst ON (relpages, reltuples) FROM pg_class;
CREATE STATISTICS tst (unrecognized) ON relname, relnatts FROM pg_class;
-- Ensure stats are dropped sanely
-- Ensure stats are dropped sanely, and test IF NOT EXISTS while at it
CREATE TABLE ab1 (a INTEGER, b INTEGER, c INTEGER);
CREATE STATISTICS ab1_a_b_stats ON a, b FROM ab1;
CREATE STATISTICS IF NOT EXISTS ab1_a_b_stats ON a, b FROM ab1;
CREATE STATISTICS IF NOT EXISTS ab1_a_b_stats ON a, b FROM ab1;
DROP STATISTICS ab1_a_b_stats;
CREATE SCHEMA regress_schema_2;