Changed lock order for MERGE of range partitions + change for issue #247

[kovdb75]

1) Changed lock order for MERGE of range partitions: the parent table is locked first and then are locked the partitions. 2) Change for issue #247: need to skip non-existing relations for Citus compatibility.

[codecov[bot]]

Codecov Report

Merging #248 (8101d6d) into master (e57e04d) will increase coverage by 0.59%. The diff coverage is 100.00%.

:exclamation: Current head 8101d6d differs from pull request most recent head 66543e7. Consider uploading reports for the commit 66543e7 to get more accurate results

@@            Coverage Diff             @@
##           master     #248      +/-   ##
==========================================
+ Coverage   91.45%   92.04%   +0.59%     
==========================================
  Files          43       34       -9     
  Lines        7255     6626     -629     
==========================================
- Hits         6635     6099     -536     
+ Misses        620      527      -93     

Impacted Files	Coverage Δ
src/pl_range_funcs.c	96.48% <100.00%> (-0.02%)	:arrow_down:
src/utility_stmt_hooking.c	92.77% <100.00%> (+0.55%)	:arrow_up:
src/planner_tree_modification.c	86.74% <0.00%> (-1.79%)	:arrow_down:
src/include/compat/pg_compat.h	92.30% <0.00%> (-1.03%)	:arrow_down:
src/utils.c	92.10% <0.00%> (-0.66%)	:arrow_down:
src/init.c	91.02% <0.00%> (-0.22%)	:arrow_down:
src/runtime_merge_append.c	69.51% <0.00%> (-0.18%)	:arrow_down:
src/partition_filter.c	96.44% <0.00%> (-0.14%)	:arrow_down:
src/hooks.c	92.28% <0.00%> (-0.11%)	:arrow_down:
src/partition_creation.c	96.81% <0.00%> (-0.09%)	:arrow_down:
... and 24 more

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