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8ff51fbf74
The patch adds read and write support for BINARY columns in Kudu
tables.
Predicate push down is implemented, but is incomplete:
a constant binary argument will be only pushed down if
the constant folding never encounters non-ascii strings.
Examples:
- cast(unhex(hex("aa")) as binary) can be pushed down
- cast(hex(unhex("aa")) as binary) can't be pushed
down as unhex("aa") is not ascii (even though the
final result is ascii)
See IMPALA-10349 for more details on this limitation.
The patch also changes casting BINARY <-> STRING from noop
to calling an actual function. While this may add some small
overhead it allows the backend to know whether an expression
returns STRING or BINARY.
Change-Id: Iff701a4b3a09ce7b6982c5d238e65f3d4f3d1151
Reviewed-on: http://gerrit.cloudera.org:8080/18868
Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>