Greenplum Database 6.11.1 includes this change:

• Greenplum Platform Extension Framework (PXF) version 5.15.1 is included, which includes changes and bug fixes. Refer to the PXF Release Notes for more information on release content and to access the PXF documentation.

Pivotal Greenplum 6.11.1 resolves these issues:

30751, 173714727 - Query Optimizer

Resolves an issue where a correlated subquery that contained at least one left or right outer join caused the Greenplum Database master to crash when the server configuration parameter optimizer_join_order was set to exhaustive2.

30880 - gpload

Fixed a problem where gpload operations would fail if a table column name included capital letters or special characters.

30901 - GPORCA

For queries that included an outer ref in a subquery, such as select * from foo where foo.a = (select foo.b from bar), GPORCA always used the results of the subquery after unnesting the outer reference. This could cause a crash or incorrect results if the subquery returned no rows, or if the subquery contained a projection with multiple values below the outer reference. To address this problem, all such queries now fall back to using the Postgres planner instead of GPORCA. Note that this behavior occurs for cases where GPORCA would have returned correct results, as well as for cases that could cause crashes or return incorrect results.

30913, 170824967 - gpfdists

A command that accessed an external table using the gpfdists protocol failed if the external table did not use an IP address when specifying a host system in the LOCATION clause of the external table definition. This issue is resolved in Greenplum 6.11.1.

174609237 - gpstart

gpstart was updated so that it does not attempt to start a standby master segment when that segment is unreachable, preventing an associated stack trace during startup.

See Upgrading from an Earlier Greenplum 6 Release to upgrade your existing Greenplum 6.x software to Greenplum 6.11.0.

Greenplum Database 6.11.0 includes these new and changed features:

• GPORCA partition elimination has been enhanced to support a subset of lossy assignment casts that are order-preserving (increasing) functions, including timestamp::date and float::int. For example, GPORCA supports partition elimination when a partition column is defined with the timestamp datatype and the query contains a predicate such as WHERE ts::date == '2020-05-10' that performs a cast on the partitioned column (ts) to compare column data (a timestamp) to a date.
• PXF version 5.15.0 is included, which includes new and changed features and bug fixes. Refer to the PXF Release Notes for more information on release content and supported platforms, and to access the PXF documentation.
• Greenplum Command Center 6.3.0 and 4.11.0 are included, which include new workload management and other features, as well as bug fixes. See the Command Center Release Notes for more information.
• The DataDirect ODBC Drivers for Pivotal Greenplum were updated to version 07.16.0389 (B0562, U0408). This version introduces support for the following datatypes:

  Greenplum Datatype	ODBC Datatype
  citext	SQL_LONGVARCHAR
  float	SQL_REAL
  tinyint	SQL_SMALLINT
  wchar	SQL_CHAR
  wvarchar	SQL_VARCHAR

Pivotal Greenplum 6.11.0 resolves these issues:

30899 - Resource Groups

In some cases when running queries are managed by resource groups, Greenplum Database generated a PANIC when managing runaway queries (queries that use an excessive amount of memory) because of locking issues. This issue is resolved.

30877 - VACUUM

In some cases, running VACUUM returns ERROR: found xmin <xid> from before relfrozenxid <frozen_xid>. The error was caused when a previously run VACUUM FULL was interrupted and aborted on a query executor (QE) and corrupted catalog frozen XID information. This issue is resolved.

30870 - Segment Mirroring

In some cases, performing an incremental recovery of a Greenplum Database segment instance failed with the message requested WAL segment has already been removed because the recovery checkpoint was not created properly. This issue is resolved.

30858 - analyzedb

analyzedb failed if analyzedb attempted to update statistics for a set of tables and one of the tables was dropped and then recreated while analyzedb was running. analyzedb has been enhanced better handle the specified situation.

30845 - Query Execution

Under heavy load when running multiple queries, some queries randomly failed with the error Error on receive from seg<ID>. The error was caused when Greenplum Database encountered a divide by 0 error while managing the backend processes that are used to run queries on the segment instances. This issue is resolved.

30761 - Postgres Planner

In some cases, Greenplum Database generated a PANIC when a DROP VIEW command was cancelled from the Greenplum Command Center. The PANIC was generated when Greenplum Database did not correctly handle the visibility of the relation.

30637 - Query Optimizer

For some queries against partitioned tables, GPORCA did not perform partition elimination when a predicate that includes the partition column also performs an explicit cast. For example, GPORCA would not perform partition elimination when a partition column is defined with the timestamp datatype and the query contains a predicate such as WHERE ts::date == '2020-05-10' that performs a cast on the partitioned column (ts) to compare column data (a timestamp) to a date. GPORCA partition elimination has been improved to support the specified type of query. See Features.

10491 - Postgres Planner

For some queries that contain nested subqueries that do not specify a relation and also contain a nested GROUP BY clauses, Greenplum Database generated a PANIC. The PANIC was generated when Greenplum Database did not correctly manage the subquery correctly. This is an example of the specified type or query.

SELECT * FROM (SELECT * FROM (SELECT c1, SUM(c2) c2 FROM mytbl GROUP BY c1 ) t2 ) t3
  GROUP BY c2, ROLLUP((c1))
  ORDER BY 1, 2;

This issue is resolved.

10561 - Server

Greenplum Database does not support altering the datatype of a column defined as a distribution key or with a constraint. When attempting to change the datatype, the error message did not clearly indicate the cause. The error message has been altered to provide more information.

174505130 - Resource Groups

In some cases for a query managed by resource group, the resource group cancelled the query with the message Canceling query because of high VMEM usage because the resource group calculated the incorrect memory used by the query. This issue is resolved.

174353156 - Interconnect

In some cases when Greenplum Database uses proxies for interconnect communication (the server configuration parameter gp_interconnect_type is set to proxy), a Greenplum background worker process became an orphaned process after the postmaster process was terminated. This issue is resolved.

174205590 - Interconnect

When Greenplum Database uses proxies for interconnect communication (the server configuration parameter gp_interconnect_type is set to proxy), a query might have hung if the query contains multiple concurrent subplans running on the segment instances. The query hung when the Greenplum interconnect did not properly handle the communication among the concurrent subplans. This issue is resolved.

174483149 - Cluster Management - gpinitsystem

gpinitsystem now exports the MASTER_DATA_DIRECTORY environment variable before calling gpconfig, to avoid throwing warning messages when configuring system parameters on Greenplum Database appliances (DCA).

See Upgrading from an Earlier Greenplum 6 Release to upgrade your existing Greenplum 6.x software to Greenplum 6.11.0.