ColumnStore Execution Plan (CSEP) for MariaDB Enterprise ColumnStore

This page is part of MariaDB's Documentation.

The parent of this page is: Query Plans and Optimizer Trace for MariaDB Enterprise ColumnStore

Topics on this page:

Overview
Viewing the CSEP

Overview

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

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

Viewing the CSEP

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

Calling the calSetTrace(1) function:
```
SELECT calSetTrace(1);
```

Executing the query:

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

Calling the calGetTrace() function:
```
SELECT calGetTrace();
```