[DRILL-7771] Order by and limit transactions in RDBMS cannot be pushdown

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 1.17.0
• Fix Version/s: 1.19.0
• Component/s: Query Planning & Optimization
• Assignee: Vova Vysotskyi
• Reporter: Yusuf
• Reviewer: Vitalii Diravka
• Created: 27/Jul/20 07:02
• Updated: 03/Dec/20 16:47
• Resolved: 03/Dec/20 16:47

Description

hi, 

When using ORDER BY, LIMIT and OFFSET in large tables in RDBMS, it draws the entire table on DRILL and it occurs very slow or heap memory. When we look at the query plan, instead of having ORDER BY, LIMIT and OFFSET features done by RDBMS, DRILL does it by pulling all the data on it. It is very critical to transmit these transactions to the database.

ISSUE # 7490
https://issues.apache.org/jira/browse/drıll-7490

The LIMIT pushdown problem was communicated as resolved but there was a missing solution. I wrote the necessary comment in the comment section.

Regardless of the number of columns selected, regardless of the number of joins and tables, pushdown should be done in RDBMS

Issue Links

• is related to: DRILL-7490 limit is not pushed to JDBC storage plugin