[CALCITE-1130] Add unary operator support for IS_NULL and IS_NOT_NULL to RexImplicationChecker

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.7.0
• Assignee: Julian Hyde
• Reporter: Amogh Margoor
• Created: 08/Mar/16 06:00
• Updated: 22/Mar/16 01:18
• Resolved: 08/Mar/16 20:06

Description

Currently we support only SQL Comparison operators (SqlKind.COMPARE) for checking if one predicate implies another using RexImplicationChecker.
We would like to extend it for couple of Unary operators based on user request ( CALCITE-1104): IS_NULL and IS_NOT_NULL