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  1. MariaDB Server
  2. MDEV-34041

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

Details

    Description

      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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          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-34301 ANALYZE FORMAT=JSON doesn't show expression cache for IN subqueries

          • Major - Major loss of function.
          • Open

          Bug - A problem which impairs or prevents the functions of the product. MDEV-34665 Simplify IN predicate processing for NULL-aware materialization involving only one column

          • Major - Major loss of function.
          • Closed

          Activity

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            oleg.smirnov Oleg Smirnov added a comment -

            Please take a look at the PR. Is there anything else we would like to add to the output?

            oleg.smirnov Oleg Smirnov added a comment - Please take a look at the PR . Is there anything else we would like to add to the output?
            psergei Sergei Petrunia added a comment -

            oleg.smirnov, I've left comments on the https://github.com/MariaDB/server/pull/3241.

            psergei Sergei Petrunia added a comment - oleg.smirnov , I've left comments on the https://github.com/MariaDB/server/pull/3241 .
            oleg.smirnov Oleg Smirnov added a comment -

            psergei, please review the next iteration.

            oleg.smirnov Oleg Smirnov added a comment - psergei , please review the next iteration .
            psergei Sergei Petrunia added a comment -

            I've discovered that for (some?) IN subqueries, Expression_cache in employed, but not shown in the EXPLAIN/ANALYZE output: MDEV-34301.

            The cache affects the counter values.

            psergei Sergei Petrunia added a comment - I've discovered that for (some?) IN subqueries, Expression_cache in employed, but not shown in the EXPLAIN/ANALYZE output: MDEV-34301 . The cache affects the counter values.
            oleg.smirnov Oleg Smirnov added a comment -

            psergei, please look at the next revision

            oleg.smirnov Oleg Smirnov added a comment - psergei , please look at the next revision
            psergei Sergei Petrunia added a comment -

            Ok to push

            psergei Sergei Petrunia added a comment - Ok to push
            oleg.smirnov Oleg Smirnov added a comment -

            Pushed into 10.5 (commit).

            oleg.smirnov Oleg Smirnov added a comment - Pushed into 10.5 ( commit ).

            People

              oleg.smirnov Oleg Smirnov
              oleg.smirnov Oleg Smirnov
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              Dates

                Created:
                Updated:
                Resolved:

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