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Don't print extra parens around expressions in extended stats

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The code printing expressions for extended statistics doubled the
parens, producing results like ((a+1)), which is unnecessary and not
consistent with how we print expressions elsewhere.

Fixed by tweaking the code to produce just a single set of parens.

Reported by Mark Dilger, fix by me. Backpatch to 14, where support for
extended statistics on expressions was added.

Reported-by: Mark Dilger
Discussion: https://postgr.es/m/20210122040101.GF27167%40telsasoft.com
pull/69/merge
Tomas Vondra 4 years ago
parent 47029f775a
commit 13380e1476
4 changed files with 60 additions and 60 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 2
      src/backend/utils/adt/ruleutils.c
  2. 2
      src/bin/pg_dump/t/002_pg_dump.pl
  3. 6
      src/test/regress/expected/create_table_like.out
  4. 16
      src/test/regress/expected/stats_ext.out

2
src/backend/utils/adt/ruleutils.c
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@ -1712,7 +1712,7 @@ pg_get_statisticsobj_worker(Oid statextid, bool columns_only, bool missing_ok)
{
Node *expr = (Node *) lfirst(lc);
char *str;
int prettyFlags = PRETTYFLAG_INDENT;
int prettyFlags = PRETTYFLAG_PAREN;
str = deparse_expression_pretty(expr, context, false, false,
prettyFlags, 0);

2
src/bin/pg_dump/t/002_pg_dump.pl
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@ -2811,7 +2811,7 @@ my %tests = (
create_sql => 'CREATE STATISTICS dump_test.test_ext_stats_expr
ON (2 * col1) FROM dump_test.test_fifth_table',
regexp => qr/^
\QCREATE STATISTICS dump_test.test_ext_stats_expr ON ((2 * col1)) FROM dump_test.test_fifth_table;\E
\QCREATE STATISTICS dump_test.test_ext_stats_expr ON (2 * col1) FROM dump_test.test_fifth_table;\E
/xms,
like =>
{ %full_runs, %dump_test_schema_runs, section_post_data => 1, },

6
src/test/regress/expected/create_table_like.out
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@ -417,7 +417,7 @@ Check constraints:
"ctlt1_a_check" CHECK (length(a) > 2)
Statistics objects:
"public.ctlt_all_a_b_stat" ON a, b FROM ctlt_all
"public.ctlt_all_expr_stat" ON ((a || b)) FROM ctlt_all
"public.ctlt_all_expr_stat" ON (a || b) FROM ctlt_all
SELECT c.relname, objsubid, description FROM pg_description, pg_index i, pg_class c WHERE classoid = 'pg_class'::regclass AND objoid = i.indexrelid AND c.oid = i.indexrelid AND i.indrelid = 'ctlt_all'::regclass ORDER BY c.relname, objsubid;
relname | objsubid | description
@ -457,7 +457,7 @@ Check constraints:
"ctlt1_a_check" CHECK (length(a) > 2)
Statistics objects:
"public.pg_attrdef_a_b_stat" ON a, b FROM public.pg_attrdef
"public.pg_attrdef_expr_stat" ON ((a || b)) FROM public.pg_attrdef
"public.pg_attrdef_expr_stat" ON (a || b) FROM public.pg_attrdef
DROP TABLE public.pg_attrdef;
-- Check that LIKE isn't confused when new table masks the old, either
@ -479,7 +479,7 @@ Check constraints:
"ctlt1_a_check" CHECK (length(a) > 2)
Statistics objects:
"ctl_schema.ctlt1_a_b_stat" ON a, b FROM ctlt1
"ctl_schema.ctlt1_expr_stat" ON ((a || b)) FROM ctlt1
"ctl_schema.ctlt1_expr_stat" ON (a || b) FROM ctlt1
ROLLBACK;
DROP TABLE ctlt1, ctlt2, ctlt3, ctlt4, ctlt12_storage, ctlt12_comments, ctlt1_inh, ctlt13_inh, ctlt13_like, ctlt_all, ctla, ctlb CASCADE;

16
src/test/regress/expected/stats_ext.out
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@ -3006,8 +3006,8 @@ set search_path to public, stts_s1, stts_s2, tststats;
\dX
List of extended statistics
Schema | Name | Definition | Ndistinct | Dependencies | MCV
----------+------------------------+------------------------------------------------------------------------+-----------+--------------+---------
public | func_deps_stat | ((a * 2)), upper(b), ((c + (1)::numeric)) FROM functional_dependencies | | defined |
----------+------------------------+------------------------------------------------------------------+-----------+--------------+---------
public | func_deps_stat | (a * 2), upper(b), (c + 1::numeric) FROM functional_dependencies | | defined |
public | mcv_lists_arrays_stats | a, b, c FROM mcv_lists_arrays | | | defined
public | mcv_lists_bool_stats | a, b, c FROM mcv_lists_bool | | | defined
public | mcv_lists_stats | a, b, d FROM mcv_lists | | | defined
@ -3041,8 +3041,8 @@ set search_path to public, stts_s1, stts_s2, tststats;
\dX+
List of extended statistics
Schema | Name | Definition | Ndistinct | Dependencies | MCV
----------+------------------------+------------------------------------------------------------------------+-----------+--------------+---------
public | func_deps_stat | ((a * 2)), upper(b), ((c + (1)::numeric)) FROM functional_dependencies | | defined |
----------+------------------------+------------------------------------------------------------------+-----------+--------------+---------
public | func_deps_stat | (a * 2), upper(b), (c + 1::numeric) FROM functional_dependencies | | defined |
public | mcv_lists_arrays_stats | a, b, c FROM mcv_lists_arrays | | | defined
public | mcv_lists_bool_stats | a, b, c FROM mcv_lists_bool | | | defined
public | mcv_lists_stats | a, b, d FROM mcv_lists | | | defined
@ -3084,8 +3084,8 @@ set search_path to public, stts_s1;
\dX
List of extended statistics
Schema | Name | Definition | Ndistinct | Dependencies | MCV
---------+------------------------+------------------------------------------------------------------------+-----------+--------------+---------
public | func_deps_stat | ((a * 2)), upper(b), ((c + (1)::numeric)) FROM functional_dependencies | | defined |
---------+------------------------+------------------------------------------------------------------+-----------+--------------+---------
public | func_deps_stat | (a * 2), upper(b), (c + 1::numeric) FROM functional_dependencies | | defined |
public | mcv_lists_arrays_stats | a, b, c FROM mcv_lists_arrays | | | defined
public | mcv_lists_bool_stats | a, b, c FROM mcv_lists_bool | | | defined
public | mcv_lists_stats | a, b, d FROM mcv_lists | | | defined
@ -3102,8 +3102,8 @@ set role regress_stats_ext;
\dX
List of extended statistics
Schema | Name | Definition | Ndistinct | Dependencies | MCV
--------+------------------------+------------------------------------------------------------------------+-----------+--------------+---------
public | func_deps_stat | ((a * 2)), upper(b), ((c + (1)::numeric)) FROM functional_dependencies | | defined |
--------+------------------------+------------------------------------------------------------------+-----------+--------------+---------
public | func_deps_stat | (a * 2), upper(b), (c + 1::numeric) FROM functional_dependencies | | defined |
public | mcv_lists_arrays_stats | a, b, c FROM mcv_lists_arrays | | | defined
public | mcv_lists_bool_stats | a, b, c FROM mcv_lists_bool | | | defined
public | mcv_lists_stats | a, b, d FROM mcv_lists | | | defined

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