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Alvaro Herrera 7103ebb7aa Add support for MERGE SQL command ... MERGE performs actions that modify rows in the target table using a source table or query. MERGE provides a single SQL statement that can conditionally INSERT/UPDATE/DELETE rows -- a task that would otherwise require multiple PL statements. For example, MERGE INTO target AS t USING source AS s ON t.tid = s.sid WHEN MATCHED AND t.balance > s.delta THEN UPDATE SET balance = t.balance - s.delta WHEN MATCHED THEN DELETE WHEN NOT MATCHED AND s.delta > 0 THEN INSERT VALUES (s.sid, s.delta) WHEN NOT MATCHED THEN DO NOTHING; MERGE works with regular tables, partitioned tables and inheritance hierarchies, including column and row security enforcement, as well as support for row and statement triggers and transition tables therein. MERGE is optimized for OLTP and is parameterizable, though also useful for large scale ETL/ELT. MERGE is not intended to be used in preference to existing single SQL commands for INSERT, UPDATE or DELETE since there is some overhead. MERGE can be used from PL/pgSQL. MERGE does not support targetting updatable views or foreign tables, and RETURNING clauses are not allowed either. These limitations are likely fixable with sufficient effort. Rewrite rules are also not supported, but it's not clear that we'd want to support them. Author: Pavan Deolasee <pavan.deolasee@gmail.com> Author: Álvaro Herrera <alvherre@alvh.no-ip.org> Author: Amit Langote <amitlangote09@gmail.com> Author: Simon Riggs <simon.riggs@enterprisedb.com> Reviewed-by: Peter Eisentraut <peter.eisentraut@enterprisedb.com> Reviewed-by: Andres Freund <andres@anarazel.de> (earlier versions) Reviewed-by: Peter Geoghegan <pg@bowt.ie> (earlier versions) Reviewed-by: Robert Haas <robertmhaas@gmail.com> (earlier versions) Reviewed-by: Japin Li <japinli@hotmail.com> Reviewed-by: Justin Pryzby <pryzby@telsasoft.com> Reviewed-by: Tomas Vondra <tomas.vondra@enterprisedb.com> Reviewed-by: Zhihong Yu <zyu@yugabyte.com> Discussion: https://postgr.es/m/CANP8+jKitBSrB7oTgT9CY2i1ObfOt36z0XMraQc+Xrz8QB0nXA@mail.gmail.com Discussion: https://postgr.es/m/CAH2-WzkJdBuxj9PO=2QaO9-3h3xGbQPZ34kJH=HukRekwM-GZg@mail.gmail.com Discussion: https://postgr.es/m/20201231134736.GA25392@alvherre.pgsql		4 years ago
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binary.sql	…
ddl.sql	Add support for MERGE SQL command	4 years ago
decoding_in_xact.sql	Stabilize test_decoding touching with sequences	4 years ago
decoding_into_rel.sql	Add decoding of sequences to test_decoding	4 years ago
messages.sql	…
permissions.sql	…
prepared.sql	…
replorigin.sql	Stabilize test_decoding touching with sequences	4 years ago
rewrite.sql	Stabilize test_decoding touching with sequences	4 years ago
sequence.sql	Fix skip-empty-xacts with sequences in test_decoding	4 years ago
slot.sql	Stabilize test_decoding touching with sequences	4 years ago
spill.sql	…
stats.sql	…
stream.sql	Fix assertion during streaming of multi-insert toast changes.	4 years ago
time.sql	…
toast.sql	Add decoding of sequences to test_decoding	4 years ago
truncate.sql	Add decoding of sequences to test_decoding	4 years ago
twophase.sql	Use PG_TEST_TIMEOUT_DEFAULT for pg_regress suite non-elapsing timeouts.	4 years ago
twophase_stream.sql	…
xact.sql	…