[IMPALA-3282] Add build-in regex_escape()

• Type: New Feature
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: Impala 2.5.0
• Fix Version/s: Impala 2.12.0
• Component/s: Backend
• Labels: built-in-function ramp-up
• Target Version: Product Backlog
• Assignee: Jin Chul Kim
• Reporter: Huaisi Xu
• Created: 31/Mar/16 16:46
• Updated: 25/Apr/18 20:06
• Resolved: 01/Feb/18 05:45

Description

This escapes all special characters in regex expression so that user can focus on more human readable input.

i.e. if we want match literal ".*\t" then escape this would be "\\.\\*\t".