[DRILL-6811] Fix type inference to return correct data mode for boolean functions

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.14.0
• Fix Version/s: 1.15.0
• Labels: ready-to-commit
• Assignee: Vova Vysotskyi
• Reporter: Vova Vysotskyi
• Reviewer: Arina Ielchiieva
• Created: 24/Oct/18 09:41
• Updated: 08/Jul/19 17:05
• Resolved: 28/Oct/18 19:48

Description

For some functions which return a boolean result and cannot return null values DrillDefaultSqlReturnTypeInference.inferReturnType() returns type with nullable data mode.

Examples of the functions which cannot return nulls:

• IS NULL
• IS NOT NULL
• NOT
• IS TRUE

and other.

Issue Links

• links to: GitHub Pull Request #1510