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postgresql/src/backend/parser
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Peter Eisentraut d6f96ed94e Allow specifying column list for foreign key ON DELETE SET actions 
Extend the foreign key ON DELETE actions SET NULL and SET DEFAULT by
allowing the specification of a column list, like

    CREATE TABLE posts (
        ...
        FOREIGN KEY (tenant_id, author_id) REFERENCES users ON DELETE SET NULL (author_id)
    );

If a column list is specified, only those columns are set to
null/default, instead of all the columns in the foreign-key
constraint.

This is useful for multitenant or sharded schemas, where the tenant or
shard ID is included in the primary key of all tables but shouldn't be
set to null.

Author: Paul Martinez <paulmtz@google.com>
Discussion: https://www.postgresql.org/message-id/flat/CACqFVBZQyMYJV=njbSMxf+rbDHpx=W=B7AEaMKn8dWn9OZJY7w@mail.gmail.com
 		2021-12-08 11:13:57 +01:00
..
.gitignore Convert cvsignore to gitignore, and add .gitignore for build targets. 2010-09-22 12:57:04 +02:00
Makefile Split all OBJS style lines in makefiles into one-line-per-entry style. 2019-11-05 14:41:07 -08:00
README Move keywords.c/kwlookup.c into src/common/. 2016-03-23 20:22:08 -04:00
analyze.c Disable anonymous record hash support except in special cases 2021-09-08 09:55:04 +02:00
check_keywords.pl Update copyright for 2021 2021-01-02 13:06:25 -05:00
gram.y Allow specifying column list for foreign key ON DELETE SET actions 2021-12-08 11:13:57 +01:00
parse_agg.c Fix check_agg_arguments' examination of aggregate FILTER clauses. 2021-08-18 18:12:51 -04:00
parse_clause.c Remove Value node struct 2021-09-09 08:36:53 +02:00
parse_coerce.c Don't elide casting to typmod -1. 2021-08-06 17:32:54 -04:00
parse_collate.c Update copyright for 2021 2021-01-02 13:06:25 -05:00
parse_cte.c Remove Value node struct 2021-09-09 08:36:53 +02:00
parse_enr.c Update copyright for 2021 2021-01-02 13:06:25 -05:00
parse_expr.c Remove Value node struct 2021-09-09 08:36:53 +02:00
parse_func.c Avoid O(N^2) behavior in SyncPostCheckpoint(). 2021-11-02 11:31:54 -04:00
parse_node.c Remove Value node struct 2021-09-09 08:36:53 +02:00
parse_oper.c Use a hash table to speed up NOT IN(values) 2021-07-07 16:29:17 +12:00
parse_param.c Update copyright for 2021 2021-01-02 13:06:25 -05:00
parse_relation.c Remove Value node struct 2021-09-09 08:36:53 +02:00
parse_target.c Remove bogus assertion in transformExpressionList(). 2021-10-19 11:35:15 -04:00
parse_type.c Remove Value node struct 2021-09-09 08:36:53 +02:00
parse_utilcmd.c Clarify use of "statistics objects" in the code 2021-09-29 15:29:38 +09:00
parser.c Re-implement pl/pgsql's expression and assignment parsing. 2021-01-04 11:52:00 -05:00
scan.l Improve some comments in scanner files 2021-12-01 16:10:52 +01:00
scansup.c Update copyright for 2021 2021-01-02 13:06:25 -05:00

README 

src/backend/parser/README

Parser
======

This directory does more than tokenize and parse SQL queries.  It also
creates Query structures for the various complex queries that are passed
to the optimizer and then executor.

parser.c	things start here
scan.l		break query into tokens
scansup.c	handle escapes in input strings
gram.y		parse the tokens and produce a "raw" parse tree
analyze.c	top level of parse analysis for optimizable queries
parse_agg.c	handle aggregates, like SUM(col1),  AVG(col2), ...
parse_clause.c	handle clauses like WHERE, ORDER BY, GROUP BY, ...
parse_coerce.c	handle coercing expressions to different data types
parse_collate.c	assign collation information in completed expressions
parse_cte.c	handle Common Table Expressions (WITH clauses)
parse_expr.c	handle expressions like col, col + 3, x = 3 or x = 4
parse_func.c	handle functions, table.column and column identifiers
parse_node.c	create nodes for various structures
parse_oper.c	handle operators in expressions
parse_param.c	handle Params (for the cases used in the core backend)
parse_relation.c support routines for tables and column handling
parse_target.c	handle the result list of the query
parse_type.c	support routines for data type handling
parse_utilcmd.c	parse analysis for utility commands (done at execution time)

See also src/common/keywords.c, which contains the table of standard
keywords and the keyword lookup function.  We separated that out because
various frontend code wants to use it too.