Changelog entries for 11.3.0 (#6856)

In this release, I tried something different. I experimented with adding
the PR number and title to the changelog right before each changelog
entry. This way, it is easier to track where a particular changelog
entry comes from. After reviews are over, I plan to remove those lines
with PR numbers and titles.

I went through all the PRs that are merged after 11.2.0 release and came
up with a list of PRs that may need help with changelog entries. You can
see details on PRs grouped in several sections below.

## PRs with missing entries

The following PRs below do not have a changelog entry. If you think that
this is a mistake, please share it in this PR along with a suggestion on
what the changelog item should be.

PR #6846 : fix 3 flaky tests in failure schedule
PR #6844 : Add CPU usage to citus_stat_tenants
PR #6833 : Fix citus_stat_tenants period updating bug
PR #6787 : Add more tests for ddl coverage
PR #6842 : Add build-cdc-* temporary directories to .gitignore
PR #6841 : Add build-cdc-* temporary directories to .gitignore
PR #6840 : Bump Citus to 12.0devel
PR #6824 : Fixes flakiness in multi_metadata_sync test
PR #6811 : Backport identity column improvements to v11.2
PR #6830 : In run_test.py actually return worker_count
PR #6825 : Fixes flakiness in multi_cluster_management test
PR #6816 : Refactor run_test.py
PR #6817 : Explicitly disallow local rels when inserting into dist table
PR #6821 : Rename citus stats tenants
PR #6822 : Add some more tests for initial sql support
PR #6819 : Fix flakyness in
citus_split_shard_by_split_points_deferred_drop
PR #6814 : Make python-regress based tests runnable with run_test.py
PR #6813 : Fix flaky multi_mx_schema_support test
PR #6720 : Convert columnar tap tests to pytest
PR #6812 : Revoke statistics permissions from public and grant them to
pg_monitor
PR #6769 : Citus stats tenants guc
PR #6807 : Fix the incorrect (constant) value passed to pointer-to-bool
parameter, pass a NULL as the value is not used
PR #6797 : Attribute local queries and cached plans on local execution
PR #6796 : Parse the annotation string correctly
PR #6762 : Add logs to citus_stats_tenants
PR #6773 : Add initial sql support for distributed tables that don't
have a shard key
PR #6792 : Disentangle MERGE planning code from the modify-planning code
path
PR #6761 : Citus stats tenants collector view
PR #6791 : Make 8 more tests runnable multiple times via run_test.py
PR #6786 : Refactor some of the planning code to accommodate a new
planning path for MERGE SQL
PR #6789 : Rename AllRelations.. functions to AllDistributedRelations..
PR #6788 : Actually skip arbitrary_configs_router & nested_execution for
AllNullDistKeyDefaultConfig
PR #6783 : Add a config for arbitrary config tests where all the tables
are null-shard-key tables
PR #6784 : Fix attach partition: citus local to null distributed
PR #6782 : Add an arbitrary config test heavily based on
multi_router_planner_fast_path.sql
PR #6781 : Decide what to do with router planner error at one place
PR #6778 : Support partitioning for dist tables with null dist keys
PR #6766 : fix pip lock file
PR #6764 : Make workerCount configurable for regression tests
PR #6745 : Add support for creating distributed tables with a null shard
key
PR #6696 : This implements MERGE phase-III
PR #6767 : Add pytest depedencies to Pipfile
PR #6760 : Decide core distribution params in CreateCitusTable
PR #6759 : Add multi_create_fdw into minimal_schedule
PR #6743 : Replace CITUS_TABLE_WITH_NO_DIST_KEY checks with
HasDistributionKey()
PR #6751 : Stabilize single_node.sql and others that report illegal node
removal
PR #6742 : Refactor CreateDistributedTable()
PR #6747 : Remove unused lock functions
PR #6744 : Fix multiple output version arbitrary config tests
PR #6741 : Stabilize single node tests
PR #6740 : Fix string eval bug in migration files check
PR #6736 : Make run_test.py and create_test.py importable without errors
PR #6734 : Don't blanket ignore flake8 E402 error
PR #6737 : Fixes bookworm packaging pipeline problem
PR #6735 : Fix run_test.py on python 3.9
PR #6733 : MERGE: In deparser, add missing check for RETURNING clause.
PR #6714 : Remove auto_explain workaround in citus explain hook for
ALTER TABLE
PR #6719 : Fix flaky test
PR #6718 : Add more powerfull dependency tracking to run_test.py
PR #6710 : Install non-vulnerable cryptography package
PR #6711 : Support compilation and run tests on latest PG versions
PR #6700 : Add auto-formatting and linting to our python code
PR #6707 : Allow multi_insert_select to run repeatably
PR #6708 : Fix flakyness in failure_create_distributed_table_non_empty
PR #6698 : Miscellaneous cleanup
PR #6704 : Update README for 11.2
PR #6703 : Fix dubious ownership error from git
PR #6690 : Bump Citus to 11.3devel

## Too long changelog entries

The following PRs have changelog entries that are too long to fit in a
single line. I'd expect authors to supply at changelog entries in
`DESCRIPTION:` lines that are at most 78 characters. If you want to
supply multi-line changelog items, you can have multiple lines that
start with `DESCRIPTION:` instead.

PR #6837 : fixes update propagation bug when
`citus_set_coordinator_host` is called more than once
PR #6738 :  Identity column implementation refactorings
PR #6756 : Schedule parallel shard moves in background rebalancer by
removing task dependencies between shard moves across colocation groups.
PR #6793 : Add a GUC to disallow planning the queries that reference
non-colocated tables via router planner
PR #6726 : fix memory leak during altering distributed table with a lot
of partition and shards
PR #6722 : fix memory leak during distribution of a table with a lot of
partitions
PR #6693 : prevent memory leak during ConvertTable with a lot of
partitions

## Empty changelog entries.

The following PR had an empty `DESCRIPTION:` line. This generates an
empty changelog line that needs to be removed manually. Please either
provide a short entry, or remove `DESCRIPTION:` line completely.

PR #6810 : Make CDC decoder an independent extension
PR #6827 : Makefile changes to build CDC in builddir for pgoutput and
wal2json.

---------

Co-authored-by: Onur Tirtir <onurcantirtir@gmail.com>

CHANGELOG.md

@@ -1,3 +1,71 @@
+### citus v11.3.0 (May 2, 2023) ###
+
+* Introduces CDC implementation for Citus using logical replication
+  (#6623, #6810, #6827)
+
+* Adds support for `MERGE` command on co-located distributed tables joined on
+  distribution column (#6696, #6733)
+
+* Adds the view `citus_stats_tenants` that monitor statistics on tenant usages
+  (#6725)
+
+* Adds the GUC `citus.max_background_task_executors_per_node` to control number
+  of background task executors involving a node (#6771)
+
+* Allows parallel shard moves in background rebalancer (#6756)
+
+* Introduces the GUC `citus.metadata_sync_mode` that introduces nontransactional
+  mode for metadata sync (#6728, #6889)
+
+* Propagates CREATE/ALTER/DROP PUBLICATION statements for distributed tables
+  (#6776)
+
+* Adds the GUC `citus.enable_non_colocated_router_query_pushdown` to ensure
+  generating a consistent distributed plan for the queries that reference
+  non-colocated distributed tables when set to "false" (#6793)
+
+* Checks if all moves are able to be done via logical replication for rebalancer
+  (#6754)
+
+* Correctly reports shard size in `citus_shards` view (#6748)
+
+* Fixes a bug in shard copy operations (#6721)
+
+* Fixes a bug that prevents enforcing identity column restrictions on worker
+  nodes (#6738)
+
+* Fixes a bug with `INSERT .. SELECT` queries with identity columns (#6802)
+
+* Fixes an issue that caused some queries with custom aggregates to fail (#6805)
+
+* Fixes an issue when `citus_set_coordinator_host` is called more than once
+  (#6837)
+
+* Fixes an uninitialized memory access in shard split API (#6845)
+
+* Fixes memory leak and max allocation block errors during metadata syncing
+  (#6728)
+
+* Fixes memory leak in `undistribute_table` (#6693)
+
+* Fixes memory leak in `alter_distributed_table` (#6726)
+
+* Fixes memory leak in `create_distributed_table` (#6722)
+
+* Fixes memory leak issue with query results that returns single row (#6724)
+
+* Improves rebalancer when shard groups have placement count less than worker
+  count (#6739)
+
+* Makes sure to stop maintenance daemon when dropping a database even without
+  Citus extension (#6688)
+
+* Prevents using `alter_distributed_table` and `undistribute_table` UDFs when a
+  table has identity columns (#6738)
+
+* Prevents using identity columns on data types other than `bigint` on
+  distributed tables (#6738)
+
 ### citus v11.2.1 (April 20, 2023) ###
 
 * Correctly reports shard size in `citus_shards` view (#6748)