PREHOOK: query: SELECT explode(col) AS myCol FROM 
    (SELECT array(1,2,3) AS col FROM src LIMIT 1 
     UNION ALL
     SELECT IF(false, array(1,2,3), NULL) AS col FROM src LIMIT 1) a
PREHOOK: type: QUERY
PREHOOK: Input: default@src
#### A masked pattern was here ####
POSTHOOK: query: SELECT explode(col) AS myCol FROM 
    (SELECT array(1,2,3) AS col FROM src LIMIT 1 
     UNION ALL
     SELECT IF(false, array(1,2,3), NULL) AS col FROM src LIMIT 1) a
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
#### A masked pattern was here ####
1
2
3
PREHOOK: query: SELECT explode(col) AS (myCol1,myCol2) FROM
    (SELECT map(1,'one',2,'two',3,'three') AS col FROM src LIMIT 1
     UNION ALL
     SELECT IF(false, map(1,'one',2,'two',3,'three'), NULL) AS col FROM src LIMIT 1) a
PREHOOK: type: QUERY
PREHOOK: Input: default@src
#### A masked pattern was here ####
POSTHOOK: query: SELECT explode(col) AS (myCol1,myCol2) FROM
    (SELECT map(1,'one',2,'two',3,'three') AS col FROM src LIMIT 1
     UNION ALL
     SELECT IF(false, map(1,'one',2,'two',3,'three'), NULL) AS col FROM src LIMIT 1) a
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
#### A masked pattern was here ####
1	one
2	two
3	three