Add support for PGCustomBinaryOperator regex

Add basic support for PGCustomBinaryOperator regex.

Author: mjgarton

datafusion/sql/src/expr/binary_op.rs

@@ -68,6 +68,7 @@ impl<S: ContextProvider> SqlToRel<'_, S> {
             BinaryOperator::Question => Ok(Operator::Question),
             BinaryOperator::QuestionAnd => Ok(Operator::QuestionAnd),
             BinaryOperator::QuestionPipe => Ok(Operator::QuestionPipe),
+            BinaryOperator::PGCustomBinaryOperator(custom) if custom == ["pg_catalog", "~"] => Ok(Operator::RegexMatch),
             _ => not_impl_err!("Unsupported binary operator: {:?}", op),
         }
     }