From: Yugo Nagata <nagata@sraoss.co.jp>
Date: Wed, 11 Nov 2020 17:01:25 +0900
Subject: [PATCH v39 4/8] Add Incremental View Maintenance support to pg_dump

Support CREATE INCREMENTAL MATERIALIZED VIEW syntax.
---
 src/bin/pg_dump/pg_dump.c        | 14 +++++++++++++-
 src/bin/pg_dump/pg_dump.h        |  2 ++
 src/bin/pg_dump/t/002_pg_dump.pl | 18 ++++++++++++++++++
 3 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index f67daf85911..9a5f65659e3 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -7196,6 +7196,7 @@ getTables(Archive *fout, int *numTables)
 	int			i_relacl;
 	int			i_acldefault;
 	int			i_ispartition;
+	int			i_isivm;
 
 	/*
 	 * Find all the tables and table-like objects.
@@ -7277,6 +7278,13 @@ getTables(Archive *fout, int *numTables)
 	appendPQExpBufferStr(query,
 						 "c.relispartition AS ispartition ");
 
+	if (fout->remoteVersion >= 200000)
+		appendPQExpBufferStr(query,
+							 "c.relisivm AS isivm ");
+	else
+		appendPQExpBufferStr(query,
+							 "false AS isivm ");
+
 	/*
 	 * Left join to pg_depend to pick up dependency info linking sequences to
 	 * their owning column, if any (note this dependency is AUTO except for
@@ -7387,6 +7395,7 @@ getTables(Archive *fout, int *numTables)
 	i_relacl = PQfnumber(res, "relacl");
 	i_acldefault = PQfnumber(res, "acldefault");
 	i_ispartition = PQfnumber(res, "ispartition");
+	i_isivm = PQfnumber(res, "isivm");
 
 	if (dopt->lockWaitTimeout)
 	{
@@ -7469,6 +7478,7 @@ getTables(Archive *fout, int *numTables)
 			tblinfo[i].amname = pg_strdup(PQgetvalue(res, i, i_amname));
 		tblinfo[i].is_identity_sequence = (strcmp(PQgetvalue(res, i, i_is_identity_sequence), "t") == 0);
 		tblinfo[i].ispartition = (strcmp(PQgetvalue(res, i, i_ispartition), "t") == 0);
+		tblinfo[i].isivm = (strcmp(PQgetvalue(res, i, i_isivm), "t") == 0);
 
 		/* other fields were zeroed above */
 
@@ -17202,10 +17212,12 @@ dumpTableSchema(Archive *fout, const TableInfo *tbinfo)
 		 * PostgreSQL 18 has disabled UNLOGGED for partitioned tables, so
 		 * ignore it when dumping if it was set in this case.
 		 */
-		appendPQExpBuffer(q, "CREATE %s%s %s",
+		appendPQExpBuffer(q, "CREATE %s%s%s %s",
 						  (tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED &&
 						   tbinfo->relkind != RELKIND_PARTITIONED_TABLE) ?
 						  "UNLOGGED " : "",
+						  tbinfo->relkind == RELKIND_MATVIEW && tbinfo->isivm ?
+						  "INCREMENTAL " : "",
 						  reltypename,
 						  qualrelname);
 
diff --git a/src/bin/pg_dump/pg_dump.h b/src/bin/pg_dump/pg_dump.h
index 5a6726d8b12..4408c504323 100644
--- a/src/bin/pg_dump/pg_dump.h
+++ b/src/bin/pg_dump/pg_dump.h
@@ -347,6 +347,8 @@ typedef struct _tableInfo
 	int			numParents;		/* number of (immediate) parent tables */
 	struct _tableInfo **parents;	/* TableInfos of immediate parents */
 
+	bool		isivm;			/* is incrementally maintainable materialized view? */
+
 	/*
 	 * These fields are computed only if we decide the table is interesting
 	 * (it's either a table to dump, or a direct parent of a dumpable table).
diff --git a/src/bin/pg_dump/t/002_pg_dump.pl b/src/bin/pg_dump/t/002_pg_dump.pl
index 9258948b583..8abde57e4f3 100644
--- a/src/bin/pg_dump/t/002_pg_dump.pl
+++ b/src/bin/pg_dump/t/002_pg_dump.pl
@@ -3033,6 +3033,24 @@ my %tests = (
 		},
 	},
 
+	'CREATE MATERIALIZED VIEW matview_ivm' => {
+		create_order => 21,
+		create_sql   => 'CREATE INCREMENTAL MATERIALIZED VIEW dump_test.matview_ivm (col1) AS
+					   SELECT col1 FROM dump_test.test_table;',
+		regexp => qr/^
+			\QCREATE INCREMENTAL MATERIALIZED VIEW dump_test.matview_ivm AS\E
+			\n\s+\QSELECT col1\E
+			\n\s+\QFROM dump_test.test_table\E
+			\n\s+\QWITH NO DATA;\E
+			/xm,
+		like =>
+		  { %full_runs, %dump_test_schema_runs, section_pre_data => 1, },
+		unlike => {
+			exclude_dump_test_schema => 1,
+			only_dump_measurement => 1,
+		},
+	},
+
 	'CREATE POLICY p1 ON test_table' => {
 		create_order => 22,
 		create_sql => 'CREATE POLICY p1 ON dump_test.test_table
-- 
2.43.0


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