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postgres_fdw: Teach IMPORT FOREIGN SCHEMA about partitioning.

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Don't import partitions.  Do import partitioned tables which are
not themselves partitions.

Report by Stephen Frost.  Design and patch by Michael Paquier,
reviewed by Amit Langote.  Documentation revised by me.

Discussion: http://postgr.es/m/20170309141531.GD9812@tamriel.snowman.net
This commit is contained in:
Robert Haas
2017-03-31 15:01:35 -04:00
parent e306df7f9c
commit f49bcd4ef3
4 changed files with 55 additions and 5 deletions
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11
contrib/postgres_fdw/postgres_fdw.c
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@ -3849,6 +3849,10 @@ postgresImportForeignSchema(ImportForeignSchemaStmt *stmt, Oid serverOid)
* should save a few cycles to not process excluded tables in the
* first place.)
*
* Ignore table data for partitions and only include the definitions
* of the root partitioned tables to allow access to the complete
* remote data set locally in the schema imported.
*
* Note: because we run the connection with search_path restricted to
* pg_catalog, the format_type() and pg_get_expr() outputs will always
* include a schema name for types/functions in other schemas, which
@ -3897,10 +3901,15 @@ postgresImportForeignSchema(ImportForeignSchemaStmt *stmt, Oid serverOid)
CppAsString2(RELKIND_RELATION) ","
CppAsString2(RELKIND_VIEW) ","
CppAsString2(RELKIND_FOREIGN_TABLE) ","
CppAsString2(RELKIND_MATVIEW) ") "
CppAsString2(RELKIND_MATVIEW) ","
CppAsString2(RELKIND_PARTITIONED_TABLE) ") "
" AND n.nspname = ");
deparseStringLiteral(&buf, stmt->remote_schema);
/* Partitions are supported since Postgres 10 */
if (PQserverVersion(conn) >= 100000)
appendStringInfoString(&buf, " AND NOT c.relispartition ");
/* Apply restrictions for LIMIT TO and EXCEPT */
if (stmt->list_type == FDW_IMPORT_SCHEMA_LIMIT_TO ||
stmt->list_type == FDW_IMPORT_SCHEMA_EXCEPT)