Refactor initialize_func_info()

[afiskon]

Refactor initialize_func_info()

Replace unnecessary chain of ts_extension_schema_oid() ->
ts_extension_schema_name() -> get_namespace_oid() calls with
a single OID lookup.

[codecov]

Codecov Report

Merging #3348 (49ca827) into master (001f5d9) will decrease coverage by 1.57%.
The diff coverage is 88.45%.

❗ Current head 49ca827 differs from pull request most recent head 5999af5. Consider uploading reports for the commit 5999af5 to get more accurate results

@@            Coverage Diff             @@
##           master    #3348      +/-   ##
==========================================
- Coverage   92.17%   90.59%   -1.58%     
==========================================
  Files         110      212     +102     
  Lines       14177    35588   +21411     
==========================================
+ Hits        13067    32240   +19173     
- Misses       1110     3348    +2238     

Impacted Files	Coverage Δ
src/bgw/launcher_interface.c	72.22% <ø> (+1.63%)	⬆️
src/catalog.h	100.00% <ø> (ø)
src/chunk.c	95.90% <ø> (+1.37%)	⬆️
src/chunk.h	100.00% <ø> (ø)
src/chunk_adaptive.c	92.57% <ø> (+2.78%)	⬆️
src/chunk_append/chunk_append.c	97.41% <ø> (+0.90%)	⬆️
src/chunk_append/exec.c	95.84% <ø> (+1.66%)	⬆️
src/chunk_append/explain.c	82.81% <ø> (ø)
src/chunk_append/planner.c	93.38% <ø> (-2.27%)	⬇️
src/chunk_append/transform.c	96.66% <ø> (-3.34%)	⬇️
... and 282 more

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