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For the following query: select item from ( select item from (select a as item from t1) tt union all select item from (select a as item from t1) tt ) ttt; There is an if predicate in buildSimpleColFromDerivedTable() that compares the outermost query field name (ttt.item) to the returned column list of the inner query (tt.item) when building the returned column list of the outer most query. In the above query example, the inner query field name is an alias set in the inner most query and is set to "`tt`.`item`", while the outermost query field name is set to "item". The use of backticks "`" in the inner query alias is causing the execution to not enter the if block which creates the SimpleColumn for the outermost query field name. As a fix, we strip off the backticks from the inner query alias.
MariaDB ColumnStore Storage engine 23.02.X
It is built by porting InfiniDB 4.6.7 on MariaDB and adding entirely new features not found anywhere else.
Building
This repository is not meant to be built independently outside of MariaDB server.
https://github.com/MariaDB/server
See building instructions here.
Issue tracking
Issue tracking of MariaDB ColumnStore happens in JIRA, https://jira.mariadb.org/browse/MCOL