Execution Plan (CSEP)

The ColumnStore Execution Plan (CSEP) is the internal query-plan representation in MariaDB ColumnStore, generated from SELECT_LEX and viewable through calSetTrace.

Overview

The ColumnStore storage engine uses a ColumnStore Execution Plan (CSEP) to represent a query plan internally.

When the select handler receives the SELECT_LEX object, it transforms it into a CSEP as part of the query planning and optimization process. For additional information, see "MariaDB ColumnStore Query Evaluation."

Viewing the CSEP

The CSEP for a given query can be viewed by performing the following:

1. Calling the calSetTrace(1) function:

SELECT calSetTrace(1);

1. Executing the query:

SELECT column1, column2
FROM columnstore_tab
WHERE column1 > '2020-04-01'
AND column1 < '2020-11-01';

1. Calling the calGetTrace() function:

SELECT calGetTrace();

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