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Tom Lane 88452d5ba6 Implement ALTER TABLE ADD UNIQUE/PRIMARY KEY USING INDEX. 
This feature allows a unique or pkey constraint to be created using an
already-existing unique index.  While the constraint isn't very
functionally different from the bare index, it's nice to be able to do that
for documentation purposes.  The main advantage over just issuing a plain
ALTER TABLE ADD UNIQUE/PRIMARY KEY is that the index can be created with
CREATE INDEX CONCURRENTLY, so that there is not a long interval where the
table is locked against updates.

On the way, refactor some of the code in DefineIndex() and index_create()
so that we don't have to pass through those functions in order to create
the index constraint's catalog entries.  Also, in parse_utilcmd.c, pass
around the ParseState pointer in struct CreateStmtContext to save on
notation, and add error location pointers to some error reports that didn't
have one before.

Gurjeet Singh, reviewed by Steve Singer and Tom Lane
 		2011-01-25 15:43:05 -05:00
..
.gitignore Convert cvsignore to gitignore, and add .gitignore for build targets. 2010-09-22 12:57:04 +02:00
Makefile Remove cvs keywords from all files. 2010-09-20 22:08:53 +02:00
README Remove cvs keywords from all files. 2010-09-20 22:08:53 +02:00
analyze.c Stamp copyrights for year 2011. 2011-01-01 13:18:15 -05:00
gram.y Implement ALTER TABLE ADD UNIQUE/PRIMARY KEY USING INDEX. 2011-01-25 15:43:05 -05:00
keywords.c Stamp copyrights for year 2011. 2011-01-01 13:18:15 -05:00
kwlookup.c Stamp copyrights for year 2011. 2011-01-01 13:18:15 -05:00
parse_agg.c Stamp copyrights for year 2011. 2011-01-01 13:18:15 -05:00
parse_clause.c Stamp copyrights for year 2011. 2011-01-01 13:18:15 -05:00
parse_coerce.c Allow casting a table's row type to the table's supertype if it's a typed table 2011-01-01 23:04:14 +02:00
parse_cte.c Stamp copyrights for year 2011. 2011-01-01 13:18:15 -05:00
parse_expr.c Stamp copyrights for year 2011. 2011-01-01 13:18:15 -05:00
parse_func.c Stamp copyrights for year 2011. 2011-01-01 13:18:15 -05:00
parse_node.c Stamp copyrights for year 2011. 2011-01-01 13:18:15 -05:00
parse_oper.c Stamp copyrights for year 2011. 2011-01-01 13:18:15 -05:00
parse_param.c Stamp copyrights for year 2011. 2011-01-01 13:18:15 -05:00
parse_relation.c Stamp copyrights for year 2011. 2011-01-01 13:18:15 -05:00
parse_target.c Stamp copyrights for year 2011. 2011-01-01 13:18:15 -05:00
parse_type.c Stamp copyrights for year 2011. 2011-01-01 13:18:15 -05:00
parse_utilcmd.c Implement ALTER TABLE ADD UNIQUE/PRIMARY KEY USING INDEX. 2011-01-25 15:43:05 -05:00
parser.c Stamp copyrights for year 2011. 2011-01-01 13:18:15 -05:00
scan.l Stamp copyrights for year 2011. 2011-01-01 13:18:15 -05:00
scansup.c Stamp copyrights for year 2011. 2011-01-01 13:18:15 -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
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)