[SPARK-18214] Simplify RuntimeReplaceable type coercion

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.1.0
• Component/s: SQL
• Target Version/s: 2.1.0
• Assignee: Reynold Xin
• Reporter: Reynold Xin
• Created: 02/Nov/16 00:33
• Updated: 02/Nov/16 22:52
• Resolved: 02/Nov/16 22:52

Description

RuntimeReplaceable is used to create aliases for expressions, but the way it deals with type coercion is pretty weird (each expression is responsible for how to handle type coercion, which does not obey the normal implicit type cast rules).

Issue Links

• relates to: SPARK-16609 Single function for parsing timestamps/dates
• links to: [Github] Pull Request #15723 (rxin)