Bohdan Kazydub created DRILL-6574:
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Summary: Add LIMIT(0) on top of SCAN for a prepare statement
Key: DRILL-6574
URL: https://issues.apache.org/jira/browse/DRILL-6574
Project: Apache Drill
Issue Type: Task
Reporter: Bohdan Kazydub
Assignee: Bohdan Kazydub
Currently prepare statements use LIMIT 0 to get the result schema. Adding
LIMIT(0) on top of SCAN causes an early termination of the query.
Create an option "planner.enable_limit0_on_scan", enabled by default. Change
"planner.enable_limit0_optimization" option to be enabled by default.
LIMIT(0) on SCAN for UNION and complex functions are disabled i.e. UNION and
complex functions need data to produce result schema.
If function is unsupported, the plan won't be affected.
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