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From "Vladimir Ozerov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IGNITE-10311) SQL: Create system view with query co-location plans
Date Fri, 16 Nov 2018 18:08:00 GMT
Vladimir Ozerov created IGNITE-10311:
----------------------------------------

             Summary: SQL: Create system view with query co-location plans
                 Key: IGNITE-10311
                 URL: https://issues.apache.org/jira/browse/IGNITE-10311
             Project: Ignite
          Issue Type: Task
          Components: sql
            Reporter: Vladimir Ozerov
             Fix For: 2.8


It is very important to understand model of distributed execution for certain queries for
performance tuning. Let's create a syhstem view which will iterate over cached two-step queries
and print their plans in table form. 

Approximate structure (very raw):
{code}
CREATE VIEW sql_query_plan (
    plan_id, // Unique plan ID (node ID + unique local ID)
    sql, // Plain text
    sql_hash. // May be more convenient that query_id
    flags // Same query with different flags may result in different plans
)

CREATE VIEW sql_query_plan_fragments (
    plan_id, // Same plan ID
    order, // Together with plan_id it forms PK
    action, // What is this - "reduce", "skip reduce", "map", etc. (may be we will need multiple
columns)
    sql, // SQL of the fragment (if applicable)
)
{code}

Next user may list cached plans, select interesting, and query plan fragments view. 

We need to analyze other vendors to better understand what to show in views.



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