Built-in system schemas that should be ignored when querying for user-defined tables
since they contain dozens of built-in system tables that are likely not needed.
Parse the enum values from a column_type value on an enum column, which is a string like
“enum(‘apple’,‘banana’,‘cher,ry’,‘ora’‘nge’)”
We need to handle the case where the enum value itself contains a comma or a
single quote (escaped with another quote), so we use a regex to do so
Parse the specified column as a TEXT COLUMN. We only support the set of types that are
represented as an encoded-string in both the mysql-common binary query response and binlog
event representation, OR types that we’ve added explicit casting support for.