Switch EXPLAIN to unaligned output for json/xml/yaml

Use unaligned output for multiple EXPLAIN queries using non-text format
in regression tests. With aligned output adding/removing explain fields
can be very disruptive, as it often modifies the whole block because of
padding. Unaligned output does not have this issue.

Author: Tomas Vondra <tomas@vondra.me>
Reviewed-by: Melanie Plageman <melanieplageman@gmail.com>
Reviewed-by: Lukas Fittl <lukas@fittl.com>
Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/flat/a177a6dd-240b-455a-8f25-aca0b1c08c6e%40vondra.me

src/test/regress/expected/explain.out

@@ -93,164 +93,160 @@ select explain_filter('explain (analyze, buffers, format text) select * from int
  Execution Time: N.N ms
 (3 rows)
 
-select explain_filter('explain (analyze, buffers, format xml) select * from int8_tbl i8');
-                     explain_filter                     
---------------------------------------------------------
- <explain xmlns="http://www.postgresql.org/N/explain"> +
-   <Query>                                             +
-     <Plan>                                            +
-       <Node-Type>Seq Scan</Node-Type>                 +
-       <Parallel-Aware>false</Parallel-Aware>          +
-       <Async-Capable>false</Async-Capable>            +
-       <Relation-Name>int8_tbl</Relation-Name>         +
-       <Alias>i8</Alias>                               +
-       <Startup-Cost>N.N</Startup-Cost>                +
-       <Total-Cost>N.N</Total-Cost>                    +
-       <Plan-Rows>N</Plan-Rows>                        +
-       <Plan-Width>N</Plan-Width>                      +
-       <Actual-Startup-Time>N.N</Actual-Startup-Time>  +
-       <Actual-Total-Time>N.N</Actual-Total-Time>      +
-       <Actual-Rows>N.N</Actual-Rows>                  +
-       <Actual-Loops>N</Actual-Loops>                  +
-       <Disabled>false</Disabled>                      +
-       <Shared-Hit-Blocks>N</Shared-Hit-Blocks>        +
-       <Shared-Read-Blocks>N</Shared-Read-Blocks>      +
-       <Shared-Dirtied-Blocks>N</Shared-Dirtied-Blocks>+
-       <Shared-Written-Blocks>N</Shared-Written-Blocks>+
-       <Local-Hit-Blocks>N</Local-Hit-Blocks>          +
-       <Local-Read-Blocks>N</Local-Read-Blocks>        +
-       <Local-Dirtied-Blocks>N</Local-Dirtied-Blocks>  +
-       <Local-Written-Blocks>N</Local-Written-Blocks>  +
-       <Temp-Read-Blocks>N</Temp-Read-Blocks>          +
-       <Temp-Written-Blocks>N</Temp-Written-Blocks>    +
-     </Plan>                                           +
-     <Planning>                                        +
-       <Shared-Hit-Blocks>N</Shared-Hit-Blocks>        +
-       <Shared-Read-Blocks>N</Shared-Read-Blocks>      +
-       <Shared-Dirtied-Blocks>N</Shared-Dirtied-Blocks>+
-       <Shared-Written-Blocks>N</Shared-Written-Blocks>+
-       <Local-Hit-Blocks>N</Local-Hit-Blocks>          +
-       <Local-Read-Blocks>N</Local-Read-Blocks>        +
-       <Local-Dirtied-Blocks>N</Local-Dirtied-Blocks>  +
-       <Local-Written-Blocks>N</Local-Written-Blocks>  +
-       <Temp-Read-Blocks>N</Temp-Read-Blocks>          +
-       <Temp-Written-Blocks>N</Temp-Written-Blocks>    +
-     </Planning>                                       +
-     <Planning-Time>N.N</Planning-Time>                +
-     <Triggers>                                        +
-     </Triggers>                                       +
-     <Execution-Time>N.N</Execution-Time>              +
-   </Query>                                            +
- </explain>
-(1 row)
-
-select explain_filter('explain (analyze, serialize, buffers, format yaml) select * from int8_tbl i8');
-        explain_filter         
--------------------------------
- - Plan:                      +
-     Node Type: "Seq Scan"    +
-     Parallel Aware: false    +
-     Async Capable: false     +
-     Relation Name: "int8_tbl"+
-     Alias: "i8"              +
-     Startup Cost: N.N        +
-     Total Cost: N.N          +
-     Plan Rows: N             +
-     Plan Width: N            +
-     Actual Startup Time: N.N +
-     Actual Total Time: N.N   +
-     Actual Rows: N.N         +
-     Actual Loops: N          +
-     Disabled: false          +
-     Shared Hit Blocks: N     +
-     Shared Read Blocks: N    +
-     Shared Dirtied Blocks: N +
-     Shared Written Blocks: N +
-     Local Hit Blocks: N      +
-     Local Read Blocks: N     +
-     Local Dirtied Blocks: N  +
-     Local Written Blocks: N  +
-     Temp Read Blocks: N      +
-     Temp Written Blocks: N   +
-   Planning:                  +
-     Shared Hit Blocks: N     +
-     Shared Read Blocks: N    +
-     Shared Dirtied Blocks: N +
-     Shared Written Blocks: N +
-     Local Hit Blocks: N      +
-     Local Read Blocks: N     +
-     Local Dirtied Blocks: N  +
-     Local Written Blocks: N  +
-     Temp Read Blocks: N      +
-     Temp Written Blocks: N   +
-   Planning Time: N.N         +
-   Triggers:                  +
-   Serialization:             +
-     Time: N.N                +
-     Output Volume: N         +
-     Format: "text"           +
-     Shared Hit Blocks: N     +
-     Shared Read Blocks: N    +
-     Shared Dirtied Blocks: N +
-     Shared Written Blocks: N +
-     Local Hit Blocks: N      +
-     Local Read Blocks: N     +
-     Local Dirtied Blocks: N  +
-     Local Written Blocks: N  +
-     Temp Read Blocks: N      +
-     Temp Written Blocks: N   +
-   Execution Time: N.N
-(1 row)
-
 select explain_filter('explain (buffers, format text) select * from int8_tbl i8');
                      explain_filter                      
 ---------------------------------------------------------
  Seq Scan on int8_tbl i8  (cost=N.N..N.N rows=N width=N)
 (1 row)
 
-select explain_filter('explain (buffers, format json) select * from int8_tbl i8');
-           explain_filter           
-------------------------------------
- [                                 +
-   {                               +
-     "Plan": {                     +
-       "Node Type": "Seq Scan",    +
-       "Parallel Aware": false,    +
-       "Async Capable": false,     +
-       "Relation Name": "int8_tbl",+
-       "Alias": "i8",              +
-       "Startup Cost": N.N,        +
-       "Total Cost": N.N,          +
-       "Plan Rows": N,             +
-       "Plan Width": N,            +
-       "Disabled": false,          +
-       "Shared Hit Blocks": N,     +
-       "Shared Read Blocks": N,    +
-       "Shared Dirtied Blocks": N, +
-       "Shared Written Blocks": N, +
-       "Local Hit Blocks": N,      +
-       "Local Read Blocks": N,     +
-       "Local Dirtied Blocks": N,  +
-       "Local Written Blocks": N,  +
-       "Temp Read Blocks": N,      +
-       "Temp Written Blocks": N    +
-     },                            +
-     "Planning": {                 +
-       "Shared Hit Blocks": N,     +
-       "Shared Read Blocks": N,    +
-       "Shared Dirtied Blocks": N, +
-       "Shared Written Blocks": N, +
-       "Local Hit Blocks": N,      +
-       "Local Read Blocks": N,     +
-       "Local Dirtied Blocks": N,  +
-       "Local Written Blocks": N,  +
-       "Temp Read Blocks": N,      +
-       "Temp Written Blocks": N    +
-     }                             +
-   }                               +
- ]
+\a
+select explain_filter('explain (analyze, buffers, format xml) select * from int8_tbl i8');
+explain_filter
+<explain xmlns="http://www.postgresql.org/N/explain">
+  <Query>
+    <Plan>
+      <Node-Type>Seq Scan</Node-Type>
+      <Parallel-Aware>false</Parallel-Aware>
+      <Async-Capable>false</Async-Capable>
+      <Relation-Name>int8_tbl</Relation-Name>
+      <Alias>i8</Alias>
+      <Startup-Cost>N.N</Startup-Cost>
+      <Total-Cost>N.N</Total-Cost>
+      <Plan-Rows>N</Plan-Rows>
+      <Plan-Width>N</Plan-Width>
+      <Actual-Startup-Time>N.N</Actual-Startup-Time>
+      <Actual-Total-Time>N.N</Actual-Total-Time>
+      <Actual-Rows>N.N</Actual-Rows>
+      <Actual-Loops>N</Actual-Loops>
+      <Disabled>false</Disabled>
+      <Shared-Hit-Blocks>N</Shared-Hit-Blocks>
+      <Shared-Read-Blocks>N</Shared-Read-Blocks>
+      <Shared-Dirtied-Blocks>N</Shared-Dirtied-Blocks>
+      <Shared-Written-Blocks>N</Shared-Written-Blocks>
+      <Local-Hit-Blocks>N</Local-Hit-Blocks>
+      <Local-Read-Blocks>N</Local-Read-Blocks>
+      <Local-Dirtied-Blocks>N</Local-Dirtied-Blocks>
+      <Local-Written-Blocks>N</Local-Written-Blocks>
+      <Temp-Read-Blocks>N</Temp-Read-Blocks>
+      <Temp-Written-Blocks>N</Temp-Written-Blocks>
+    </Plan>
+    <Planning>
+      <Shared-Hit-Blocks>N</Shared-Hit-Blocks>
+      <Shared-Read-Blocks>N</Shared-Read-Blocks>
+      <Shared-Dirtied-Blocks>N</Shared-Dirtied-Blocks>
+      <Shared-Written-Blocks>N</Shared-Written-Blocks>
+      <Local-Hit-Blocks>N</Local-Hit-Blocks>
+      <Local-Read-Blocks>N</Local-Read-Blocks>
+      <Local-Dirtied-Blocks>N</Local-Dirtied-Blocks>
+      <Local-Written-Blocks>N</Local-Written-Blocks>
+      <Temp-Read-Blocks>N</Temp-Read-Blocks>
+      <Temp-Written-Blocks>N</Temp-Written-Blocks>
+    </Planning>
+    <Planning-Time>N.N</Planning-Time>
+    <Triggers>
+    </Triggers>
+    <Execution-Time>N.N</Execution-Time>
+  </Query>
+</explain>
 (1 row)
-
+select explain_filter('explain (analyze, serialize, buffers, format yaml) select * from int8_tbl i8');
+explain_filter
+- Plan: 
+    Node Type: "Seq Scan"
+    Parallel Aware: false
+    Async Capable: false
+    Relation Name: "int8_tbl"
+    Alias: "i8"
+    Startup Cost: N.N
+    Total Cost: N.N
+    Plan Rows: N
+    Plan Width: N
+    Actual Startup Time: N.N
+    Actual Total Time: N.N
+    Actual Rows: N.N
+    Actual Loops: N
+    Disabled: false
+    Shared Hit Blocks: N
+    Shared Read Blocks: N
+    Shared Dirtied Blocks: N
+    Shared Written Blocks: N
+    Local Hit Blocks: N
+    Local Read Blocks: N
+    Local Dirtied Blocks: N
+    Local Written Blocks: N
+    Temp Read Blocks: N
+    Temp Written Blocks: N
+  Planning: 
+    Shared Hit Blocks: N
+    Shared Read Blocks: N
+    Shared Dirtied Blocks: N
+    Shared Written Blocks: N
+    Local Hit Blocks: N
+    Local Read Blocks: N
+    Local Dirtied Blocks: N
+    Local Written Blocks: N
+    Temp Read Blocks: N
+    Temp Written Blocks: N
+  Planning Time: N.N
+  Triggers: 
+  Serialization: 
+    Time: N.N
+    Output Volume: N
+    Format: "text"
+    Shared Hit Blocks: N
+    Shared Read Blocks: N
+    Shared Dirtied Blocks: N
+    Shared Written Blocks: N
+    Local Hit Blocks: N
+    Local Read Blocks: N
+    Local Dirtied Blocks: N
+    Local Written Blocks: N
+    Temp Read Blocks: N
+    Temp Written Blocks: N
+  Execution Time: N.N
+(1 row)
+select explain_filter('explain (buffers, format json) select * from int8_tbl i8');
+explain_filter
+[
+  {
+    "Plan": {
+      "Node Type": "Seq Scan",
+      "Parallel Aware": false,
+      "Async Capable": false,
+      "Relation Name": "int8_tbl",
+      "Alias": "i8",
+      "Startup Cost": N.N,
+      "Total Cost": N.N,
+      "Plan Rows": N,
+      "Plan Width": N,
+      "Disabled": false,
+      "Shared Hit Blocks": N,
+      "Shared Read Blocks": N,
+      "Shared Dirtied Blocks": N,
+      "Shared Written Blocks": N,
+      "Local Hit Blocks": N,
+      "Local Read Blocks": N,
+      "Local Dirtied Blocks": N,
+      "Local Written Blocks": N,
+      "Temp Read Blocks": N,
+      "Temp Written Blocks": N
+    },
+    "Planning": {
+      "Shared Hit Blocks": N,
+      "Shared Read Blocks": N,
+      "Shared Dirtied Blocks": N,
+      "Shared Written Blocks": N,
+      "Local Hit Blocks": N,
+      "Local Read Blocks": N,
+      "Local Dirtied Blocks": N,
+      "Local Written Blocks": N,
+      "Temp Read Blocks": N,
+      "Temp Written Blocks": N
+    }
+  }
+]
+(1 row)
+\a
 -- Check expansion of window definitions
 select explain_filter('explain verbose select sum(unique1) over w, sum(unique2) over (w order by hundred), sum(tenthous) over (w order by hundred) from tenk1 window w as (partition by ten)');
                                             explain_filter                                             

src/test/regress/sql/explain.sql

@@ -66,10 +66,13 @@ select explain_filter('explain select * from int8_tbl i8');
 select explain_filter('explain (analyze, buffers off) select * from int8_tbl i8');
 select explain_filter('explain (analyze, buffers off, verbose) select * from int8_tbl i8');
 select explain_filter('explain (analyze, buffers, format text) select * from int8_tbl i8');
+select explain_filter('explain (buffers, format text) select * from int8_tbl i8');
+
+\a
 select explain_filter('explain (analyze, buffers, format xml) select * from int8_tbl i8');
 select explain_filter('explain (analyze, serialize, buffers, format yaml) select * from int8_tbl i8');
-select explain_filter('explain (buffers, format text) select * from int8_tbl i8');
 select explain_filter('explain (buffers, format json) select * from int8_tbl i8');
+\a
 
 -- Check expansion of window definitions