Indices with multiple parameters are not parsed correctly #652

Actual Behavior

create unique null_filtered index foo on bar (baz) is parsed successfully, but the unique parameter is lost.

Expected Behavior

create unique null_filtered index foo on bar (baz) should be parsed successfully and both unique and null_filtered should be part of the parsed index definition.

Steps to Reproduce the Problem

1. Parse create unique null_filtered index foo on bar (baz)
2. Verify that the parsed CreateIndex statement does not contain the unique part

Specifications

• Version: 1.2
• Platform: Ubuntu 18.04
• Subsystem: