[CALCITE-3943] Remove the JSON functions keyword from parser

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.22.0
• Component/s: core
• Assignee: Danny Chen
• Reporter: Danny Chen
• Created: 21/Apr/20 08:08
• Updated: 11/May/20 22:06

Description

The JSON functions was introduced in CALCITE-2266, we coded the JSON keywords into the parser and generates the operator directly, so there is no chance for downstream projects to change the builtin operator and do some override.

This issue tries to remove these keywords from the parser, we should always generates SqlUnresolvedFunction instead specific operators in the SQL parser.