MatchType: Determines how the 'value' field is matched when filtering. If not specified, defaults to EXACT. If set to WILDCARD_EXPRESSION, '*' is allowed as a placeholder for variable length character sequences, and it can be escaped with a backslash. Note, only paid search dimensions ('dfa:paidSearch*') allow a matchType other than EXACT.
"BEGINS_WITH" "CONTAINS" "EXACT" "WILDCARD_EXPRESSION"