Arina Ielchiieva created DRILL-5476:
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Summary: Calculate return type precision value for substring
functions (substring. substr, left, right)
Key: DRILL-5476
URL: https://issues.apache.org/jira/browse/DRILL-5476
Project: Apache Drill
Issue Type: Improvement
Affects Versions: 1.10.0
Reporter: Arina Ielchiieva
Priority: Minor
Currently when applying substring / substr / left / right functions Drill
doesn't calculate return length. Since we know calculation rules for these
functions, we can predict return length.
For example:
substring(cast(col as varchar(10), 1, 5) -> varchar(5)
substring(cast(col as varchar(10), 5) -> varchar(5)
Similar changes has been done in DRILL-5419 for other string functions.
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