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These functions are somewhat similar in that each of them takes a DATE
argument and a time unit to work with.
They work identically to the corresponding TIMESTAMP functions. The
only difference is that the DATE functions don't accept time-of-day
units.
TRUNC(DATE d, STRING unit)
Truncates a DATE value to the specified time unit. The 'unit' argument
is case insensitive. This argument string can be one of:
SYYYY, YYYY, YEAR, SYEAR, YYY, YY, Y: Year.
Q: Quarter.
MONTH, MON, MM, RM: Month.
DDD, DD, J: Day.
DAY, DY, D: Starting day (Monday) of the week.
WW: Truncates to the most recent date, no later than 'd', which is
on the same day of the week as the first day of year.
W: Truncates to the most recent date, no later than 'd', which is on
the same day of the week as the first day of month.
The impelementation mirrors Impala's TRUNC(TIMESTAMP ts, STRING unit)
function. Hive and Oracle SQL have a similar function too.
Reference:
http://docs.oracle.com/cd/B19306_01/server.102/b14200/functions201.htm
.
DATE_TRUNC(STRING unit, DATE d)
Truncates a DATE value to the specified precision. The 'unit' argument
is case insensitive. This argument string can be one of: DAY, WEEK,
MONTH, YEAR, DECADE, CENTURY, MILLENNIUM.
The implementation mirrors Impala's DATE_TRUNC(STRING unit,
TIMESTAMP ts) function. Vertica has a similar function too.
Reference:
https://my.vertica.com/docs/8.1.x/HTML/index.htm#Authoring/
SQLReferenceManual/Functions/Date-Time/DATE_TRUNC.htm
.
EXTRACT(DATE d, STRING unit), EXTRACT(unit FROM DATE d)
Returns one of the numeric date fields from a DATE value. The 'unit'
string can be one of YEAR, QUARTER, MONTH, DAY. This argument value is
case-insensitive.
The implementation mirrors that Impala's EXTRACT(TIMESTAMP ts,
STRING unit). Hive and Oracle SQL have a similar function too.
Reference:
http://docs.oracle.com/cd/B19306_01/server.102/b14200/functions050.htm
.
DATE_PART(STRING unit, DATE date)
Similar to EXTRACT(), with the argument order reversed. Supports the
same date units as EXTRACT().
The implementation mirrors Impala's DATE_PART(STRING unit,
TIMESTAMP ts) function.
Change-Id: I843358a45eb5faa2c134994600546fc1d0a797c8
Reviewed-on: http://gerrit.cloudera.org:8080/13363
Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
183 lines
3.0 KiB
Plaintext
183 lines
3.0 KiB
Plaintext
====
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---- QUERY
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select year, count(*) from alltypes group by 1 order by 1 limit 10
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---- RESULTS
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2009,3650
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2010,3650
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---- TYPES
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INT, BIGINT
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====
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---- QUERY
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select month, count(*) from alltypes group by 1 order by 1 limit 100
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---- RESULTS
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1,620
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2,560
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3,620
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4,600
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5,620
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6,600
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7,620
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8,620
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9,600
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10,620
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11,600
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12,620
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---- TYPES
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INT, BIGINT
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====
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---- QUERY
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select year, month, count(*) from alltypes group by 1, 2 order by 1, 2 limit 100
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---- RESULTS
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2009,1,310
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2009,2,280
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2009,3,310
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2009,4,300
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2009,5,310
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2009,6,300
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2009,7,310
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2009,8,310
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2009,9,300
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2009,10,310
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2009,11,300
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2009,12,310
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2010,1,310
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2010,2,280
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2010,3,310
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2010,4,300
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2010,5,310
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2010,6,300
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2010,7,310
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2010,8,310
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2010,9,300
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2010,10,310
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2010,11,300
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2010,12,310
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---- TYPES
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INT, INT, BIGINT
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====
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---- QUERY
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select count(*) from alltypes where year=2009
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---- RESULTS
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3650
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---- TYPES
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BIGINT
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====
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---- QUERY
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# still works if 'year' needs a cast
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select count(*) from alltypes where year = 2009.0
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---- RESULTS
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3650
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---- TYPES
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BIGINT
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====
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---- QUERY
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# finds bindings for partition keys regardless of order of operands
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select count(*) from alltypes where 2009 = year
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---- RESULTS
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3650
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---- TYPES
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BIGINT
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====
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---- QUERY
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select count(*) from alltypes where 2009.0 = year
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---- RESULTS
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3650
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---- TYPES
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BIGINT
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====
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---- QUERY
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select count(*) from alltypes where month=1
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---- RESULTS
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620
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---- TYPES
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BIGINT
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====
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---- QUERY
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select count(*) from alltypes where year=2009 and month=1
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---- RESULTS
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310
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---- TYPES
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BIGINT
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====
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---- QUERY
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select count(*) from alltypes where year=2009 and month > 6
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---- RESULTS
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1840
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---- TYPES
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BIGINT
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====
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---- QUERY
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select count(*) from alltypes where year=2009 and month < 6
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---- RESULTS
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1510
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---- TYPES
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BIGINT
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====
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---- QUERY
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select count(*) from alltypes where year<=2009 and month < 6
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---- RESULTS
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1510
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---- TYPES
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BIGINT
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====
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---- QUERY
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select count(*) from alltypes where month < 9 and month > 6
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---- RESULTS
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1240
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---- TYPES
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BIGINT
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====
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---- QUERY
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select count(*) from alltypes where year < 2010 and year < 2009 and month > 6
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---- RESULTS
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0
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---- TYPES
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BIGINT
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====
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---- QUERY
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select count(*) from alltypes where year < 2010 and month > 6 and month > 12
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---- RESULTS
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0
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---- TYPES
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BIGINT
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====
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---- QUERY
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# Test multi files partitioned table (hdfs)
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select count(*) from alltypesaggmultifiles where day is not null
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---- RESULTS
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10000
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---- TYPES
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BIGINT
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====
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---- QUERY
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# Test partition pruning when a binary predicate contains a NullLiteral
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select count(*) from alltypestiny where year != null or year = null
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---- RESULTS
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0
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---- TYPES
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BIGINT
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====
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---- QUERY
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# Test partition pruning when an IN predicate contains a NullLiteral
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select count(*) from alltypesagg where day in (1, null)
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---- RESULTS
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1000
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---- TYPES
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BIGINT
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====
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---- QUERY
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# Test partition pruning when a NOT IN predicate contains a NullLiteral
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select count(*) from alltypesagg where day not in (1, 2, null)
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---- RESULTS
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0
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---- TYPES
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BIGINT
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====
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---- QUERY
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# IMPALA-2514: DCHECK on ExprContext::Close()
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select int_col from functional.alltypes
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where year=date_part('yyyyMMMdd hh:mm:ss', current_timestamp());
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---- CATCH
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InternalException: Invalid Date Part Field: yyyyMMMdd hh:mm:ss
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====
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