WL#720: Add support for [table_name].[column_name]
Affects: Server-7.1 — Status: Assigned
Add support for syntax: [table_name].[column_name] when running in sql_mode=MSSQL or SQL_MODE_QUOTE_WITH_BRACKETS This is needed to make it easy to port sql code from Microsoft SQL server to MySQL. In other words, there will be three ways to delimit identifiers: `with backticks` "with quotes" [with brackets] Since we might support arrays someday, we need to decide about cases like this: SELECT a  FROM t Is 5 the index of a, or the alias of a?
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