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Commit767982e

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Convert built-in SQL-language functions to SQL-standard-body style.
Adopt the new pre-parsed representation for all built-in andinformation_schema SQL-language functions, except for a smallnumber that can't presently be converted because they havepolymorphic arguments.This eliminates residual hazards around search-path safety ofthese functions, and might provide some small performance benefitsby reducing parsing costs. It seems useful also to provide moretest coverage for the SQL-standard-body feature.Discussion:https://postgr.es/m/3956760.1618529139@sss.pgh.pa.us
1 parente809493 commit767982e

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4 files changed

+402
-113
lines changed

4 files changed

+402
-113
lines changed

‎src/backend/catalog/information_schema.sql‎

Lines changed: 20 additions & 28 deletions
Original file line numberDiff line numberDiff line change
@@ -43,7 +43,8 @@ SET search_path TO information_schema;
4343
CREATEFUNCTION_pg_expandarray(IN anyarray, OUT x anyelement, OUT nint)
4444
RETURNS SETOF RECORD
4545
LANGUAGE sql STRICT IMMUTABLE PARALLEL SAFE
46-
AS'select $1[s], s - pg_catalog.array_lower($1,1) + 1
46+
AS'select $1[s],
47+
s operator(pg_catalog.-) pg_catalog.array_lower($1,1) operator(pg_catalog.+) 1
4748
from pg_catalog.generate_series(pg_catalog.array_lower($1,1),
4849
pg_catalog.array_upper($1,1),
4950
1) as g(s)';
@@ -52,28 +53,26 @@ CREATE FUNCTION _pg_expandarray(IN anyarray, OUT x anyelement, OUT n int)
5253
* column's position in the index (NULL if not there)*/
5354
CREATEFUNCTION_pg_index_position(oid,smallint) RETURNSint
5455
LANGUAGE sql STRICT STABLE
55-
AS $$
56+
BEGIN ATOMIC
5657
SELECT (ss.a).nFROM
5758
(SELECTinformation_schema._pg_expandarray(indkey)AS a
5859
FROMpg_catalog.pg_indexWHERE indexrelid= $1) ss
5960
WHERE (ss.a).x= $2;
60-
$$;
61+
END;
6162

6263
CREATEFUNCTION_pg_truetypid(pg_attribute, pg_type) RETURNSoid
6364
LANGUAGE sql
6465
IMMUTABLE
6566
PARALLEL SAFE
6667
RETURNSNULLONNULL INPUT
67-
AS
68-
$$SELECT CASE WHEN $2.typtype='d' THEN $2.typbasetype ELSE $1.atttypid END$$;
68+
RETURN CASE WHEN $2.typtype='d' THEN $2.typbasetype ELSE $1.atttypid END;
6969

7070
CREATEFUNCTION_pg_truetypmod(pg_attribute, pg_type) RETURNS int4
7171
LANGUAGE sql
7272
IMMUTABLE
7373
PARALLEL SAFE
7474
RETURNSNULLONNULL INPUT
75-
AS
76-
$$SELECT CASE WHEN $2.typtype='d' THEN $2.typtypmod ELSE $1.atttypmod END$$;
75+
RETURN CASE WHEN $2.typtype='d' THEN $2.typtypmod ELSE $1.atttypmod END;
7776

7877
-- these functions encapsulate knowledge about the encoding of typmod:
7978

@@ -82,40 +81,37 @@ CREATE FUNCTION _pg_char_max_length(typid oid, typmod int4) RETURNS integer
8281
IMMUTABLE
8382
PARALLEL SAFE
8483
RETURNSNULLONNULL INPUT
85-
AS
86-
$$SELECT
84+
RETURN
8785
CASE WHEN $2=-1/* default typmod*/
8886
THENnull
8987
WHEN $1IN (1042,1043)/* char, varchar*/
9088
THEN $2-4
9189
WHEN $1IN (1560,1562)/* bit, varbit*/
9290
THEN $2
9391
ELSEnull
94-
END$$;
92+
END;
9593

9694
CREATEFUNCTION_pg_char_octet_length(typidoid, typmod int4) RETURNSinteger
9795
LANGUAGE sql
9896
IMMUTABLE
9997
PARALLEL SAFE
10098
RETURNSNULLONNULL INPUT
101-
AS
102-
$$SELECT
99+
RETURN
103100
CASE WHEN $1IN (25,1042,1043)/* text, char, varchar*/
104101
THEN CASE WHEN $2=-1/* default typmod*/
105102
THEN CAST(2^30ASinteger)
106103
ELSEinformation_schema._pg_char_max_length($1, $2)*
107104
pg_catalog.pg_encoding_max_length((SELECT encodingFROMpg_catalog.pg_databaseWHERE datname=pg_catalog.current_database()))
108105
END
109106
ELSEnull
110-
END$$;
107+
END;
111108

112109
CREATEFUNCTION_pg_numeric_precision(typidoid, typmod int4) RETURNSinteger
113110
LANGUAGE sql
114111
IMMUTABLE
115112
PARALLEL SAFE
116113
RETURNSNULLONNULL INPUT
117-
AS
118-
$$SELECT
114+
RETURN
119115
CASE $1
120116
WHEN21/*int2*/ THEN16
121117
WHEN23/*int4*/ THEN32
@@ -128,63 +124,59 @@ $$SELECT
128124
WHEN700/*float4*/ THEN24/*FLT_MANT_DIG*/
129125
WHEN701/*float8*/ THEN53/*DBL_MANT_DIG*/
130126
ELSEnull
131-
END$$;
127+
END;
132128

133129
CREATEFUNCTION_pg_numeric_precision_radix(typidoid, typmod int4) RETURNSinteger
134130
LANGUAGE sql
135131
IMMUTABLE
136132
PARALLEL SAFE
137133
RETURNSNULLONNULL INPUT
138-
AS
139-
$$SELECT
134+
RETURN
140135
CASE WHEN $1IN (21,23,20,700,701) THEN2
141136
WHEN $1IN (1700) THEN10
142137
ELSEnull
143-
END$$;
138+
END;
144139

145140
CREATEFUNCTION_pg_numeric_scale(typidoid, typmod int4) RETURNSinteger
146141
LANGUAGE sql
147142
IMMUTABLE
148143
PARALLEL SAFE
149144
RETURNSNULLONNULL INPUT
150-
AS
151-
$$SELECT
145+
RETURN
152146
CASE WHEN $1IN (21,23,20) THEN0
153147
WHEN $1IN (1700) THEN
154148
CASE WHEN $2=-1
155149
THENnull
156150
ELSE ($2-4) &65535
157151
END
158152
ELSEnull
159-
END$$;
153+
END;
160154

161155
CREATEFUNCTION_pg_datetime_precision(typidoid, typmod int4) RETURNSinteger
162156
LANGUAGE sql
163157
IMMUTABLE
164158
PARALLEL SAFE
165159
RETURNSNULLONNULL INPUT
166-
AS
167-
$$SELECT
160+
RETURN
168161
CASE WHEN $1IN (1082)/* date*/
169162
THEN0
170163
WHEN $1IN (1083,1114,1184,1266)/* time, timestamp, same + tz*/
171164
THEN CASE WHEN $2<0 THEN6 ELSE $2 END
172165
WHEN $1IN (1186)/* interval*/
173166
THEN CASE WHEN $2<0OR $2 &65535=65535 THEN6 ELSE $2 &65535 END
174167
ELSEnull
175-
END$$;
168+
END;
176169

177170
CREATEFUNCTION_pg_interval_type(typidoid, mod int4) RETURNStext
178171
LANGUAGE sql
179172
IMMUTABLE
180173
PARALLEL SAFE
181174
RETURNSNULLONNULL INPUT
182-
AS
183-
$$SELECT
175+
RETURN
184176
CASE WHEN $1IN (1186)/* interval*/
185177
THENpg_catalog.upper(substring(pg_catalog.format_type($1, $2) similar'interval[()0-9]* #"%#"' escape'#'))
186178
ELSEnull
187-
END$$;
179+
END;
188180

189181

190182
-- 5.2 INFORMATION_SCHEMA_CATALOG_NAME view appears later.

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