Use psql's unaligned format in EXPLAIN tests, to make it less brittle.

In aligned format, there is an end-of-line marker at the end of each line,
and its position depends on the longest line. If the width changes, all
lines need to be adjusted for the moved end-of-line-marker.

While testing this, we found out that 'atmsort' had been doing bad things
to the YAML output before:

    -- Check Explain YAML output
    EXPLAIN (FORMAT YAML) SELECT * from boxes LEFT JOIN apples ON apples.id = boxes.apple_id LEFT JOIN box_locations ON box_locations.id = boxes.location_id;
    QUERY PLAN
    ___________
    {
      'id' => 1,
      'short' => '- Plan:                                                  +'
    }
    GP_IGNORE:(1 row)

In other worse, we were not comparing the output at all, except for that one
line that says "Plan:". The access plan for one of the queries had changed,
from a Left Join to a Right Join, and we still had the old plan memorized
in expected output, but the test was passing because atmsort hid the issue.
This commit fixes the expected output for the new plan.

src/test/regress/sql/explain_format.sql

@@ -48,40 +48,46 @@ EXPLAIN SELECT * from boxes LEFT JOIN apples ON apples.id = boxes.apple_id LEFT
 EXPLAIN (ANALYZE) SELECT * from boxes LEFT JOIN apples ON apples.id = boxes.apple_id LEFT JOIN box_locations ON box_locations.id = boxes.location_id;
 -- explain_processing_on
 
+-- Unaligned output format is better for the YAML / XML / JSON outputs.
+-- In aligned format, you have end-of-line markers at the end of each line,
+-- and its position depends on the longest line. If the width changes, all
+-- lines need to be adjusted for the moved end-of-line-marker.
+\a
+
 -- YAML Required replaces for costs and time changes
 -- start_matchsubs
--- m/ Loops: \d+ /
--- s/ Loops: \d+\s+/ Loops: # /
--- m/ Cost: \d+\.\d+ /
--- s/ Cost: \d+\.\d+\s+/ Cost: ###.## /
--- m/ Rows: \d+ /
--- s/ Rows: \d+\s+/ Rows: ##### /
--- m/ Plan Width: \d+ /
--- s/ Plan Width: \d+\s+/ Plan Width: ## /
--- m/ Time: \d+\.\d+ /
--- s/ Time: \d+\.\d+\s+/ Time: ##.### /
+-- m/ Loops: \d+/
+-- s/ Loops: \d+/ Loops: #/
+-- m/ Cost: \d+\.\d+/
+-- s/ Cost: \d+\.\d+/ Cost: ###.##/
+-- m/ Rows: \d+/
+-- s/ Rows: \d+/ Rows: #####/
+-- m/ Plan Width: \d+/
+-- s/ Plan Width: \d+/ Plan Width: ##/
+-- m/ Time: \d+\.\d+/
+-- s/ Time: \d+\.\d+/ Time: ##.###/
 -- m/Total Runtime: \d+\.\d+/
 -- s/Total Runtime: \d+\.\d+/Total Runtime: ##.###/
--- m/Segments: \d+\s+/
--- s/Segments: \d+\s+/Segments: #/
--- m/PQO version \d+\.\d+\.\d+",?\s+/
--- s/PQO version \d+\.\d+\.\d+",?\s+/PQO version ##.##.##"/
--- m/Slice: [0-3]\s+/
--- s/Slice: [0-3]\s+/Slice: # /
--- m/ Memory: \d+\s+/
--- s/ Memory: \d+\s+/ Memory: ### /
--- m/Maximum Memory Used: \d+\s+/
--- s/Maximum Memory Used: \d+\s+/Maximum Memory Used: ### /
--- m/Work Maximum Memory: \d+\s+/
--- s/Work Maximum Memory: \d+\s+/Work Maximum Memory: ### /
--- m/Workers: \d+\s+/
--- s/Workers: \d+\s+/Workers: ## /
--- m/Average: \d+\s+/
--- s/Average: \d+\s+/Average: ## /
+-- m/Segments: \d+/
+-- s/Segments: \d+/Segments: #/
+-- m/PQO version \d+\.\d+\.\d+",?/
+-- s/PQO version \d+\.\d+\.\d+",?/PQO version ##.##.##"/
+-- m/Slice: [0-3]/
+-- s/Slice: [0-3]/Slice: # /
+-- m/ Memory: \d+/
+-- s/ Memory: \d+/ Memory: ###/
+-- m/Maximum Memory Used: \d+/
+-- s/Maximum Memory Used: \d+/Maximum Memory Used: ###/
+-- m/Work Maximum Memory: \d+/
+-- s/Work Maximum Memory: \d+/Work Maximum Memory: ###/
+-- m/Workers: \d+/
+-- s/Workers: \d+/Workers: ##/
+-- m/Average: \d+/
+-- s/Average: \d+/Average: ##/
 -- m/Total memory used across slices: \d+/
 -- s/Total memory used across slices: \d+\s*/Total memory used across slices: ###/
 -- m/Memory used: \d+/
--- s/Memory used: \d+\s+/Memory used: ###/
+-- s/Memory used: \d+/Memory used: ###/
 -- m/ORCA Memory Used \w+: \d+/
 -- s/ORCA Memory Used (\w+): \d+\s+/ORCA Memory Used $1: ##/
 -- end_matchsubs
@@ -95,42 +101,42 @@ EXPLAIN (ANALYZE, FORMAT YAML) SELECT * from boxes LEFT JOIN apples ON apples.id
 
 -- JSON Required replaces for costs and time changes
 -- start_matchsubs
--- m/ Loops": \d+,?\s+/
--- s/ Loops": \d+,?\s+/ Loops": #, /
--- m/ Cost": \d+\.\d+, /
--- s/ Cost": \d+\.\d+,\s+/ Cost": ###.##, /
--- m/ Rows": \d+, /
--- s/ Rows": \d+,\s+/ Rows": #####, /
--- m/"Plan Width": \d+,? /
--- s/"Plan Width": \d+,?\s+/"Plan Width": ##, /
--- m/ Time": \d+\.\d+, /
--- s/ Time": \d+\.\d+,\s+/ Time": ##.###, /
--- m/Total Runtime": \d+\.\d+,?\s+/
--- s/Total Runtime": \d+\.\d+,?\s+/Total Runtime": ##.###,/
--- m/"Memory used": \d+,?\s+/
--- s/"Memory used": \d+,?\s+/"Memory used": ####,/
--- m/"Segments": \d+,\s+/
--- s/"Segments": \d+,\s+/"Segments": #,/
--- m/"Slice": [0-3],\s+/
--- s/"Slice": [0-3],\s+/"Slice": #, /
--- m/Executor Memory": \d+,?\s+/
--- s/Executor Memory": \d+,?\s+/Executor Memory": ### /
--- m/"Maximum Memory Used": \d+,?\s+/
--- s/"Maximum Memory Used": \d+,?\s+/"Maximum Memory Used": ###, /
--- m/"Work Maximum Memory": \d+,?\s+/
--- s/"Work Maximum Memory": \d+,?\s+/"Work Maximum Memory": ### /
--- m/"Workers": \d+,\s+/
--- s/"Workers": \d+,\s+/"Workers": ##, /
+-- m/ Loops": \d+,?/
+-- s/ Loops": \d+,?/ Loops": #,/
+-- m/ Cost": \d+\.\d+,/
+-- s/ Cost": \d+\.\d+,/ Cost": ###.##,/
+-- m/ Rows": \d+,/
+-- s/ Rows": \d+,/ Rows": #####,/
+-- m/"Plan Width": \d+,?/
+-- s/"Plan Width": \d+,?/"Plan Width": ##,/
+-- m/ Time": \d+\.\d+,/
+-- s/ Time": \d+\.\d+,/ Time": ##.###,/
+-- m/Total Runtime": \d+\.\d+,?/
+-- s/Total Runtime": \d+\.\d+,?/Total Runtime": ##.###,/
+-- m/"Memory used": \d+,?/
+-- s/"Memory used": \d+,?/"Memory used": ####,/
+-- m/"Segments": \d+,/
+-- s/"Segments": \d+,/"Segments": #,/
+-- m/"Slice": [0-3],/
+-- s/"Slice": [0-3],/"Slice": #,/
+-- m/Executor Memory": \d+,?/
+-- s/Executor Memory": \d+,?/Executor Memory": ###/
+-- m/"Maximum Memory Used": \d+,?/
+-- s/"Maximum Memory Used": \d+,?/"Maximum Memory Used": ###,/
+-- m/"Work Maximum Memory": \d+,?/
+-- s/"Work Maximum Memory": \d+,?/"Work Maximum Memory": ###/
+-- m/"Workers": \d+,/
+-- s/"Workers": \d+,/"Workers": ##,/
 -- m/Peak Memory": \d+,/
--- s/Peak Memory": \d+,\s+/Peak Memory": ###,/
+-- s/Peak Memory": \d+,/Peak Memory": ###,/
 -- m/Virtual Memory": \d+/
--- s/Virtual Memory": \d+\s+/Virtual Memory": ###/
--- m/"Average": \d+,\s+/
--- s/"Average": \d+,\s+/"Average": ##, /
+-- s/Virtual Memory": \d+/Virtual Memory": ###/
+-- m/"Average": \d+,/
+-- s/"Average": \d+,/"Average": ##, /
 -- m/"Total memory used across slices": \d+,/
 -- s/"Total memory used across slices": \d+,\s*/"Total memory used across slices": ###,/
 -- m/"ORCA Memory Used \w+": \d+,?/
--- s/"ORCA Memory Used (\w+)": \d+,?\s+/"ORCA Memory Used $1": ##/
+-- s/"ORCA Memory Used (\w+)": \d+,?/"ORCA Memory Used $1": ##/
 -- end_matchsubs
 -- explain_processing_off
 -- Check Explain JSON output
@@ -200,4 +206,4 @@ EXPLAIN (ANALYZE, FORMAT XML) SELECT * from boxes LEFT JOIN apples ON apples.id
 -- Cleanup
 DROP TABLE boxes;
 DROP TABLE apples;
-DROP TABLE box_locations;
\ No newline at end of file
+DROP TABLE box_locations;