PREHOOK: query: DESCRIBE FUNCTION hour
PREHOOK: type: DESCFUNCTION
POSTHOOK: query: DESCRIBE FUNCTION hour
POSTHOOK: type: DESCFUNCTION
hour(param) - Returns the hour componemnt of the string/timestamp/interval
PREHOOK: query: DESCRIBE FUNCTION EXTENDED hour
PREHOOK: type: DESCFUNCTION
POSTHOOK: query: DESCRIBE FUNCTION EXTENDED hour
POSTHOOK: type: DESCFUNCTION
hour(param) - Returns the hour componemnt of the string/timestamp/interval
param can be one of:
1. A string in the format of 'yyyy-MM-dd HH:mm:ss' or 'HH:mm:ss'.
2. A timestamp value
3. A day-time interval valueExample:
   > SELECT hour('2009-07-30 12:58:59') FROM src LIMIT 1;
  12
  > SELECT hour('12:58:59') FROM src LIMIT 1;
  12
PREHOOK: query: EXPLAIN
SELECT hour('2009-08-07 13:14:15'), hour('13:14:15'), hour('2009-08-07')
FROM src WHERE key = 86
PREHOOK: type: QUERY
POSTHOOK: query: EXPLAIN
SELECT hour('2009-08-07 13:14:15'), hour('13:14:15'), hour('2009-08-07')
FROM src WHERE key = 86
POSTHOOK: type: QUERY
STAGE DEPENDENCIES:
  Stage-0 is a root stage

STAGE PLANS:
  Stage: Stage-0
    Fetch Operator
      limit: -1
      Processor Tree:
        TableScan
          alias: src
          Statistics: Num rows: 500 Data size: 5312 Basic stats: COMPLETE Column stats: NONE
          Filter Operator
            predicate: (UDFToDouble(key) = 86.0) (type: boolean)
            Statistics: Num rows: 250 Data size: 2656 Basic stats: COMPLETE Column stats: NONE
            Select Operator
              expressions: 13 (type: int), 13 (type: int), null (type: int)
              outputColumnNames: _col0, _col1, _col2
              Statistics: Num rows: 250 Data size: 2656 Basic stats: COMPLETE Column stats: NONE
              ListSink

PREHOOK: query: SELECT hour('2009-08-07 13:14:15'), hour('13:14:15'), hour('2009-08-07')
FROM src WHERE key = 86
PREHOOK: type: QUERY
PREHOOK: Input: default@src
#### A masked pattern was here ####
POSTHOOK: query: SELECT hour('2009-08-07 13:14:15'), hour('13:14:15'), hour('2009-08-07')
FROM src WHERE key = 86
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
#### A masked pattern was here ####
13	13	NULL
PREHOOK: query: SELECT hour(cast('2009-08-07 13:14:15'  as timestamp))
FROM src WHERE key=86
PREHOOK: type: QUERY
PREHOOK: Input: default@src
#### A masked pattern was here ####
POSTHOOK: query: SELECT hour(cast('2009-08-07 13:14:15'  as timestamp))
FROM src WHERE key=86
POSTHOOK: type: QUERY
POSTHOOK: Input: default@src
#### A masked pattern was here ####
13