Use planner hints on PostgreSQL

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Change version to 1.3.7.

Make HashJoin hint more coercive.

Even with HashJoin hint, hash joins may be rejected by planner if hash
table for the inner-rel is estimated too large. Make HashJoin hint
more coercive by increasing hash_mem_multiplier.

Change copyright year of docs to 2020

Stabilize regression test.

I was annoyed by frequent nonsubstantial change of title line length
of explain output. This commit makes maskout.sh replace the title
lines with fixed content.

Follow a behavioral change in core.

Commit 894f5dea76 has changed the core's behavior of naming indexes.
Follow the changes. This is regression-result changes only.

Update core.c and make_join_rel.c.

From this version core.c and make_join_rel.c are automatically
generated from core code. Adjust them to auto-generated content.

New tool to generate source files for copied functions

Previously core.c and make_join_rel.c are maintained by hand. This
tool generates the files from corresponding core source files.

Add *.bc to .gitignore

Added *.bc and *~ to .gitignore

Follow the semantic change of pg_list part 2

Commit 7ed93ce forgot to fix another place where list_delete_cell() is
used. Fix it.

Support PostgreSQL 13.

- Follow change of some planner functions.

- Follow a change of the semantics of List.

- Take in changes in copied core code.

- Adjust regression tests.
Amost all of the differences are come from aliasing policy, and some
come from a new GUC parameter.

Version 1.3.6.

Fixed some bugs.

Add description of *ScanRegExp hints in the document.

English version of hint list is missing regexp versions of scan
hints. Add them.

Mask non-significant parts of regression output

To stabilize test, mask more of non-significant parts of EXPLAIN output.

Fix segfault when use Set, Rows and Parallel hints together

Fix some spelling errors in comments

Mark hint table as a configuration table.

The table hint_plan.hints is a configuration table of
pg_hint_plan. Mark it as such, as well as its sequence table.

Back patch to pg_hint_plan96.

Preparation for branch PG12

Change version to 12-1.3.5. Adjust SPEC file.

Support PG12.

As the prepparation for making PG12 branch, change PG version to 12
and adjust for the latest PG12.

Change copyright year to 2020.

Restore current hint state when returned from non-hinted query planning.

If no hint is given for the current level query, pg_hint_plan_planner
calls the next level of planner after erasing the
current_hint_state. But it forgot to restore the state before the
planning of the rest part of the current-level query. It is
(a-kind-of) broken by the commit d422966 but overlooked as an
inevitable side-effect of the fix. Get back the behavior by restoring
current_hint_state after returned from the lower level planner with
unhinted query.

Issue: https://github.com/ossc-db/pg_hint_plan/issues/30
Reported-by: higuchi-daisuke

Use proper type for non-integer GUC options.

pg_hint_plan internally preserved numeric options into integer
variable regardless of their types, which leads to unintentional
change of the values. Handle double values in the proper way.

Fix Rows hint parsing

This is a long standing bug that Rows hint with no parameter causees a
crash. Fixed the Rows hint parser.

Give correct query location to generate_normalized_query.

There was a thinko about query_loc of generate_normalized_query which
causes a crash. For example a query is following a sequence of
semicolons (by \; in psql input) longer than the length after the last
placeholder to the end of the query, the function causes assertion
failure. Anyway prepared statements lose that value so we just pass 0
as the query_loc for consistent behavior.

Fix behavior of nested planning

Issue: https://github.com/ossc-db/pg_hint_plan/issues/39

When planning is nested by function call, the hints in the function
should affect the corresponding query. Maybe 9599067 introduced
that. Fix the nested planning behavior.

Fix crash bug caused by plancache invalidation

https://github.com/ossc-db/pg_hint_plan/issues/41

After plancache is invalidated then revaliated, get_query_string
accesses query_list of invalid plansource then crash. Ignore invalid
plancache and get the correct hint string and Query node at the next
planning time during revalidation.

On the way fixing this, a bug related to planner reentrance is
fixed. That fix causes behavioral change for nested
planning. Previously outer-level hint (wrongly) overrides inner-level
query but currenlty outer-level hint no longer affects inner-level
query.

Fix compiling error on Solaris

The 'LDFLAGS+=-Wl,--build-id' option is for rpm building in Linux like
OS. The SunOS is not native support the option
'LDFLAGS+=-Wl,--build-id' . So, we disable this option in SunOS while
compiling.

Committed a bit tweaked version from the orignal.

Fix the previous commit.

The previous commit left a line to be removed. Remove it.

Do null-check of error_context_stack before use

The variable is accessed without null checking when planner is called
in the context of pl/pgsql. Fix it. Back-patched up to pg_hint_plan94.

Reporter: egashira-yusuke
Issue: https://github.com/ossc-db/pg_hint_plan/issues/42
Original-Author: sun-wei <30999182+Dagouhan@users.noreply.github.com>
Original-patch: https://github.com/ossc-db/pg_hint_plan/pull/45/commits/8fe092ef73a9af6cfb41e20717d7cb35aa74fce2

Fix regression tests.

Fix regression tests to work for PG12.

Follow the change in PG12.

Commit 428b260f87 breaks the prior assumptions by adding one more
planning cycle for updates on partitioned tables. Follow the change.