Fix handling of partition bounds for boolean partitioning columns.

Previously, you could partition by a boolean column as long as you
spelled the bound values as string literals, for instance FOR VALUES
IN ('t').  The trouble with this is that ruleutils.c printed that as
FOR VALUES IN (TRUE), which is reasonable syntax but wasn't accepted by
the grammar.  That results in dump-and-reload failures for such cases.

Apply a minimal fix that just causes TRUE and FALSE to be converted to
strings 'true' and 'false'.  This is pretty grotty, but it's too late for
a more principled fix in v11 (to say nothing of v10).  We should revisit
the whole issue of how partition bound values are parsed for v12.

Amit Langote

Discussion: https://postgr.es/m/e05c5162-1103-7e37-d1ab-6de3e0afaf70@lab.ntt.co.jp

4 files changed, 26 insertions, 3 deletions

diff --git a/doc/src/sgml/ref/create_table.sgml b/doc/src/sgml/ref/create_table.sgml
index 18a343c1abd..d52a3c49d6f 100644
--- a/doc/src/sgml/ref/create_table.sgml
+++ b/doc/src/sgml/ref/create_table.sgml
@@ -86,9 +86,9 @@ CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } | UNLOGGED ] TABLE [ IF NOT EXI
 
 <phrase>and <replaceable class="PARAMETER">partition_bound_spec</replaceable> is:</phrase>
 
-IN ( { <replaceable class="PARAMETER">numeric_literal</replaceable> | <replaceable class="PARAMETER">string_literal</replaceable> | NULL } [, ...] ) |
-FROM ( { <replaceable class="PARAMETER">numeric_literal</replaceable> | <replaceable class="PARAMETER">string_literal</replaceable> | MINVALUE | MAXVALUE } [, ...] )
-  TO ( { <replaceable class="PARAMETER">numeric_literal</replaceable> | <replaceable class="PARAMETER">string_literal</replaceable> | MINVALUE | MAXVALUE } [, ...] )
+IN ( { <replaceable class="PARAMETER">numeric_literal</replaceable> | <replaceable class="PARAMETER">string_literal</replaceable> | TRUE | FALSE | NULL } [, ...] ) |
+FROM ( { <replaceable class="PARAMETER">numeric_literal</replaceable> | <replaceable class="PARAMETER">string_literal</replaceable> | TRUE | FALSE | MINVALUE | MAXVALUE } [, ...] )
+  TO ( { <replaceable class="PARAMETER">numeric_literal</replaceable> | <replaceable class="PARAMETER">string_literal</replaceable> | TRUE | FALSE | MINVALUE | MAXVALUE } [, ...] )
 
 <phrase><replaceable class="PARAMETER">index_parameters</replaceable> in <literal>UNIQUE</literal>, <literal>PRIMARY KEY</literal>, and <literal>EXCLUDE</literal> constraints are:</phrase>
 
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index 3b9b93f84dd..43e207a2337 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -2649,6 +2649,8 @@ ForValues:
 partbound_datum:
 			Sconst			{ $$ = makeStringConst($1, @1); }
 			| NumericOnly	{ $$ = makeAConst($1, @1); }
+			| TRUE_P		{ $$ = makeStringConst(pstrdup("true"), @1); }
+			| FALSE_P		{ $$ = makeStringConst(pstrdup("false"), @1); }
 			| NULL_P		{ $$ = makeNullAConst(@1); }
 		;
 
diff --git a/src/test/regress/expected/create_table.out b/src/test/regress/expected/create_table.out
index 1e99c96703b..68dda4c0db9 100644
--- a/src/test/regress/expected/create_table.out
+++ b/src/test/regress/expected/create_table.out
@@ -811,3 +811,17 @@ Partition of: arrlp FOR VALUES IN ('{1}', '{2}')
 Partition constraint: ((a IS NOT NULL) AND (((a)::anyarray OPERATOR(pg_catalog.=) '{1}'::integer[]) OR ((a)::anyarray OPERATOR(pg_catalog.=) '{2}'::integer[])))
 
 DROP TABLE arrlp;
+-- partition on boolean column
+create table boolspart (a bool) partition by list (a);
+create table boolspart_t partition of boolspart for values in (true);
+create table boolspart_f partition of boolspart for values in (false);
+\d+ boolspart
+                                 Table "public.boolspart"
+ Column |  Type   | Collation | Nullable | Default | Storage | Stats target | Description 
+--------+---------+-----------+----------+---------+---------+--------------+-------------
+ a      | boolean |           |          |         | plain   |              | 
+Partition key: LIST (a)
+Partitions: boolspart_f FOR VALUES IN (false),
+            boolspart_t FOR VALUES IN (true)
+
+drop table boolspart;
diff --git a/src/test/regress/sql/create_table.sql b/src/test/regress/sql/create_table.sql
index 754184756c3..89e1059a71e 100644
--- a/src/test/regress/sql/create_table.sql
+++ b/src/test/regress/sql/create_table.sql
@@ -668,3 +668,10 @@ CREATE TABLE arrlp (a int[]) PARTITION BY LIST (a);
 CREATE TABLE arrlp12 PARTITION OF arrlp FOR VALUES IN ('{1}', '{2}');
 \d+ arrlp12
 DROP TABLE arrlp;
+
+-- partition on boolean column
+create table boolspart (a bool) partition by list (a);
+create table boolspart_t partition of boolspart for values in (true);
+create table boolspart_f partition of boolspart for values in (false);
+\d+ boolspart
+drop table boolspart;