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From "Internal Jenkins (Code Review)" <>
Subject [Impala-ASF-CR] IMPALA-4594: WriteSlot and CodegenWriteSlot handle escaped NULL slots differently
Date Thu, 08 Dec 2016 08:30:52 GMT
Internal Jenkins has submitted this change and it was merged.

Change subject: IMPALA-4594: WriteSlot and CodegenWriteSlot handle escaped NULL slots differently

IMPALA-4594: WriteSlot and CodegenWriteSlot handle escaped NULL slots differently

CodegenWriteSlot() receives negative length values for the lengths of
the slots passed to it if the slots contain escape characters. (This
is currently only for non-string types, as we do not codegen string
types with escaped characters). The DelimitedTextParser is responsible
for identifying escape characters and assigning the negative lengths
appropriately. CodegenWriteCompleteTuple() passes this length to
CodegenWriteSlot() as it is. This differs from the behavior of
WriteSlot() where the length passed to it is always positive, as all
the callers of WriteSlot() make sure of that (including

The IrIsNullString() and IrGenericIsNullString() functions are
responsibe for checking if the given data contains a NULL pattern.
They are called by CodegenWriteSlot(). A NULL pattern usually contains
an escaped character which means that the length of that slot will be
a negative length. However, the IrIsNullString() and
IrGenericIsNullString() that take the same length argument from
CodegenWriteSlot() always expect a positive length argument. So, no
slots were ever marked as NULL by these NULL-checking functions when
codegen was enabled.

NULL slots were still detected accidentally because of some incorrect
code in CodegenWriteSlot() that marked invalid slots and NULL slots as
NULL. Therefore, due to this code, even invalid slots were not marked
as invalid and did not return an error. Instead they were just
sliently marked as NULL.

This patch makes sure that only positive lengths are passed to
CodegenWriteSlot() so that NULL checking is correct and it also
makes sure that invalid slots are not silently marked as NULL.

Testing: Re-enabled an older hdfs-scan-node-errors test. Formatted
it to fit new error message format after IMPALA-3859 and IMPALA-3895.

Change-Id: I858e427ad7c2b2da8c2bb657be06b7443655781f
Reviewed-by: Sailesh Mukil <>
Tested-by: Internal Jenkins
M be/src/exec/
M be/src/exec/
M testdata/workloads/functional-query/queries/DataErrorsTest/hdfs-scan-node-errors.test
3 files changed, 75 insertions(+), 68 deletions(-)

  Internal Jenkins: Verified
  Sailesh Mukil: Looks good to me, approved

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Gerrit-MessageType: merged
Gerrit-Change-Id: I858e427ad7c2b2da8c2bb657be06b7443655781f
Gerrit-PatchSet: 6
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Sailesh Mukil <>
Gerrit-Reviewer: Dan Hecht <>
Gerrit-Reviewer: Internal Jenkins
Gerrit-Reviewer: Michael Ho <>
Gerrit-Reviewer: Sailesh Mukil <>

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