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postgresql/src/backend/parser
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Tom Lane 7fc0f06221 Add a WHEN clause to CREATE TRIGGER, allowing a boolean expression to be 
checked to determine whether the trigger should be fired.

For BEFORE triggers this is mostly a matter of spec compliance; but for AFTER
triggers it can provide a noticeable performance improvement, since queuing of
a deferred trigger event and re-fetching of the row(s) at end of statement can
be short-circuited if the trigger does not need to be fired.

Takahiro Itagaki, reviewed by KaiGai Kohei.
 		2009-11-20 20:38:12 +00:00
..
.cvsignore Remove all traces that suggest that a non-Bison yacc might be supported, and 2008-08-29 13:02:33 +00:00
Makefile Implement parser hooks for processing ColumnRef and ParamRef nodes, as per my 2009-10-31 01:41:31 +00:00
README Implement parser hooks for processing ColumnRef and ParamRef nodes, as per my 2009-10-31 01:41:31 +00:00
analyze.c Implement parser hooks for processing ColumnRef and ParamRef nodes, as per my 2009-10-31 01:41:31 +00:00
gram.y Add a WHEN clause to CREATE TRIGGER, allowing a boolean expression to be 2009-11-20 20:38:12 +00:00
keywords.c Tweak the core scanner so that it can be used by plpgsql too. 2009-07-14 20:24:10 +00:00
kwlookup.c Tweak the core scanner so that it can be used by plpgsql too. 2009-07-14 20:24:10 +00:00
parse_agg.c 8.4 pgindent run, with new combined Linux/FreeBSD/MinGW typedef list 2009-06-11 14:49:15 +00:00
parse_clause.c Make FOR UPDATE/SHARE in the primary query not propagate into WITH queries; 2009-10-27 17:11:18 +00:00
parse_coerce.c Implement parser hooks for processing ColumnRef and ParamRef nodes, as per my 2009-10-31 01:41:31 +00:00
parse_cte.c Make FOR UPDATE/SHARE in the primary query not propagate into WITH queries; 2009-10-27 17:11:18 +00:00
parse_expr.c A better fix for the "ARRAY[...]::domain" problem. The previous patch worked, 2009-11-13 19:48:20 +00:00
parse_func.c Implement parser hooks for processing ColumnRef and ParamRef nodes, as per my 2009-10-31 01:41:31 +00:00
parse_node.c Implement parser hooks for processing ColumnRef and ParamRef nodes, as per my 2009-10-31 01:41:31 +00:00
parse_oper.c Fix get_sort_group_operators() so that it doesn't think arrays can be grouped 2009-06-13 15:42:09 +00:00
parse_param.c Implement parser hooks for processing ColumnRef and ParamRef nodes, as per my 2009-10-31 01:41:31 +00:00
parse_relation.c Implement parser hooks for processing ColumnRef and ParamRef nodes, as per my 2009-10-31 01:41:31 +00:00
parse_target.c Implement parser hooks for processing ColumnRef and ParamRef nodes, as per my 2009-10-31 01:41:31 +00:00
parse_type.c Make backend header files C++ safe 2009-07-16 06:33:46 +00:00
parse_utilcmd.c Clean up a couple of bizarre code formatting choices in recent CREATE LIKE patch. 2009-11-13 23:49:23 +00:00
parser.c Remove pg_parse_string_token() --- not needed anymore. 2009-11-12 01:13:12 +00:00
scan.l Remove plpgsql's separate lexer (finally!), in favor of using the core lexer 2009-11-12 00:13:00 +00:00
scansup.c Remove plpgsql's separate lexer (finally!), in favor of using the core lexer 2009-11-12 00:13:00 +00:00

README 

$PostgreSQL: pgsql/src/backend/parser/README,v 1.11 2009/10/31 01:41:31 tgl Exp $

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
kwlookup.c	turn keywords into specific tokens
keywords.c	table of standard keywords (passed to kwlookup.c)
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_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)