Matthew Jacobs a16a0fa84d IMPALA-5137: Support Kudu UNIXTIME_MICROS as Impala TIMESTAMP ...

Adds Impala support for TIMESTAMP types stored in Kudu.

Impala stores TIMESTAMP values in 96-bits and has nanosecond
precision. Kudu's timestamp is a 64-bit microsecond delta
from the Unix epoch (called UNIXTIME_MICROS), so a conversion
is necessary.

When writing to Kudu, TIMESTAMP values in nanoseconds are
averaged to the nearest microsecond.

When reading from Kudu, the KuduScanner returns
UNIXTIME_MICROS with 8bytes of padding so Impala can convert
the value to a TimestampValue in-line and copy the entire
row.

Testing:
Updated the functional_kudu schema to use TIMESTAMPs instead
of converting to STRING, so this provides some decent
coverage. Some BE tests were added, and some EE tests as
well.

TODO: Support pushing down TIMESTAMP predicates
TODO: Support TIMESTAMPs in range partitioning expressions

Change-Id: Iae6ccfffb79118a9036fb2227dba3a55356c896d
Reviewed-on: http://gerrit.cloudera.org:8080/6526
Reviewed-by: Matthew Jacobs <mj@cloudera.com>
Tested-by: Impala Public Jenkins

2017-05-11 20:55:51 +00:00

76 KiB

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