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  1. MariaDB Server
  2. MDEV-34041

Additional information for materialized subqueries must be displayed in EXPLAIN/ANALYZE FORMAT=JSON

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      There is not enough information in EXPLAIN/ANALYZE output about the strategy chosen to process a subquery. This task aims to augment the output for materialized subqueries. The example of desired output is as follows:

      "subqueries": [
            {
              "NULL-AWARE-MATERIALIZATION": {
       
                "r_algorithm": "full-scan-on-null",
                "r_lookups": 122234,
                "r_full_scans": 4
       
                "query_block": {
                  "select_id": 2,
      

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              psergei Sergei Petrunia
              oleg.smirnov Oleg Smirnov
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