Horton

Make subquery aliases optional in the FROM clause.

Dean Rasheed <dean.a.rasheed@gmail.com>

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Commit: bcedd8f5fce0b69970cf0cee7bca560833d05869
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
Date: 2022-07-20T08:29:42Z
Releases: 16.0 
Make subquery aliases optional in the FROM clause.

This allows aliases for sub-SELECTs and VALUES clauses in the FROM
clause to be omitted.

This is an extension of the SQL standard, supported by some other
database systems, and so eases the transition from such systems, as
well as removing the minor inconvenience caused by requiring these
aliases.

Patch by me, reviewed by Tom Lane.

Discussion: https://postgr.es/m/CAEZATCUCGCf82=hxd9N5n6xGHPyYpQnxW8HneeH+uP7yNALkWA@mail.gmail.com

Files

PathChange+/−
doc/src/sgml/ref/select.sgml modified +13 −3
src/backend/parser/analyze.c modified +13 −6
src/backend/parser/gram.y modified +0 −44
src/backend/parser/parse_clause.c modified +6 −12
src/backend/parser/parse_relation.c modified +22 −7
src/backend/utils/adt/ruleutils.c modified +5 −1
src/include/parser/parse_node.h modified +5 −2
src/interfaces/ecpg/preproc/ecpg.addons modified +0 −6
src/test/regress/expected/subselect.out modified +69 −0
src/test/regress/sql/subselect.sql modified +31 −0

Documentation touched

Discussion