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https://issues.apache.org/jira/browse/ARROW-12114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17323884#comment-17323884
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Ben Kietzman commented on ARROW-12114:
--------------------------------------
I'll close this for now, then. Thanks all
> [C++] Dataset to table filter expression API change
> ---------------------------------------------------
>
> Key: ARROW-12114
> URL: https://issues.apache.org/jira/browse/ARROW-12114
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Reporter: Diana Clarke
> Assignee: Ben Kietzman
> Priority: Major
>
> Ben:
> Can you please confirm that we're aware and okay with the following API
> change? Thanks!
> {code}
> import pyarrow.dataset
> path_prefix = "ursa-labs-taxi-data-repartitioned-10k/"
> paths = [
>
> f"ursa-labs-taxi-data-repartitioned-10k/{year}/{month:02}/{part:04}/data.parquet"
> for year in range(2009, 2020)
> for month in range(1, 13)
> for part in range(101)
> if not (year == 2019 and month > 6) # Data ends in 2019/06
> and not (year == 2010 and month == 3) # Data is missing in 2010/03
> ]
> partitioning = pyarrow.dataset.DirectoryPartitioning.discover(
> field_names=["year", "month", "part"],
> infer_dictionary=True,
> )
> s3 = pyarrow.fs.S3FileSystem(region="us-east-2")
> dataset = pyarrow.dataset.dataset(
> paths,
> format="parquet",
> filesystem=s3,
> partitioning=partitioning,
> partition_base_dir=path_prefix,
> )
> year = pyarrow.dataset.field("year")
> month = pyarrow.dataset.field("month")
> part = pyarrow.dataset.field("part")
> filter_expr = (year == "2011") & (month == 1) & (part == 2)
> dataset.to_table(filter=filter_expr)
> {code}
> In arrow 3.0, the above code executes without error.
> On head[1], {{year == "2011"}}, which should be {{year == 2011}} (no quotes),
> raises the following exception.
> {code}
> pyarrow.lib.ArrowNotImplementedError: Function equal has no kernel matching
> input types (array[int32], scalar[string])
> {code}
> This API change appears to have been introduced in ARROW-8919. Perhaps it was
> intentional, just figured we should double check. Thanks again!
> [1] {{51c97799b8302466b9dfbb657dc23fd3f0cd8e61}}
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