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https://issues.apache.org/jira/browse/ARROW-5601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16863714#comment-16863714
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Pindikura Ravindra commented on ARROW-5601:
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There is an existing Jira ARROW-3459 to add support for variable len output
expressions in gandiva.
I'll use this Jira to add a fix that gracefully fails such expressions (instead
of crashing), till ARROW-3459 is fixed.
> [gandiva] Error when projector with a string field
> --------------------------------------------------
>
> Key: ARROW-5601
> URL: https://issues.apache.org/jira/browse/ARROW-5601
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++ - Gandiva
> Affects Versions: 0.13.0
> Environment: Ubuntu 16.04 x86_64
> Reporter: Sun Chenggen
> Assignee: Pindikura Ravindra
> Priority: Major
> Original Estimate: 48h
> Remaining Estimate: 48h
>
> when I try to select a string field by {{gandiva}} projector, it failed with
> errors.
> {code:python}
> import pandas as pd
> import pyarrow as pa
> from pyarrow import gandiva
> a = pd.DataFrame({'col1': ["asdf", "abc"]})
> tb = pa.Table.from_pandas(a)
> teb = gandiva.TreeExprBuilder()
> col1 = tb.schema[0]
> node1 = teb.make_field(col1)
> exp1 = teb.make_expression(node1, col1)
> gandiva.make_projector(tb.schema, [exp1], pa.default_memory_pool())
> {code}
> Run the code above, it crashs with error like this:
> {code:bash}
> python: ../lib/IR/Instructions.cpp:1202: void llvm::StoreInst::AssertOK():
> Assertion `getOperand(0)->getType() ==
> cast<PointerType>(getOperand(1)->getType())->getElementType() && "Ptr must be
> a pointer to Val type!"' failed. Aborted
> {code}
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