SEARCH and CYCLE clauses
This adds the SQL standard feature that adds the SEARCH and CYCLE
clauses to recursive queries to be able to do produce breadth- or
depth-first search orders and detect cycles. These clauses can be
rewritten into queries using existing syntax, and that is what this
patch does in the rewriter.
Reviewed-by: Vik Fearing <vik@postgresfriends.org>
Reviewed-by: Pavel Stehule <pavel.stehule@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/db80ceee-6f97-9b4a-8ee8-3ba0c58e5be2@2ndquadrant.com
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/3696a600e2292d43c00949ddf0352e4ebb487e5b
Modified Files
--------------
doc/src/sgml/queries.sgml | 64 ++-
doc/src/sgml/ref/select.sgml | 44 ++
src/backend/catalog/dependency.c | 15 +
src/backend/nodes/copyfuncs.c | 40 ++
src/backend/nodes/equalfuncs.c | 36 ++
src/backend/nodes/nodeFuncs.c | 42 +-
src/backend/nodes/outfuncs.c | 36 ++
src/backend/nodes/readfuncs.c | 44 ++
src/backend/parser/analyze.c | 47 ++-
src/backend/parser/gram.y | 58 ++-
src/backend/parser/parse_agg.c | 7 +
src/backend/parser/parse_cte.c | 193 +++++++++
src/backend/parser/parse_expr.c | 4 +
src/backend/parser/parse_func.c | 3 +
src/backend/parser/parse_relation.c | 54 ++-
src/backend/parser/parse_target.c | 17 +-
src/backend/rewrite/Makefile | 1 +
src/backend/rewrite/rewriteHandler.c | 18 +
src/backend/rewrite/rewriteSearchCycle.c | 668 +++++++++++++++++++++++++++++++
src/backend/utils/adt/ruleutils.c | 47 +++
src/include/nodes/nodes.h | 2 +
src/include/nodes/parsenodes.h | 30 +-
src/include/parser/analyze.h | 2 +
src/include/parser/kwlist.h | 2 +
src/include/parser/parse_node.h | 2 +
src/include/rewrite/rewriteSearchCycle.h | 21 +
src/test/regress/expected/with.out | 558 ++++++++++++++++++++++++++
src/test/regress/sql/with.sql | 279 +++++++++++++
28 files changed, 2301 insertions(+), 33 deletions(-)