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https://issues.apache.org/jira/browse/BEAM-6474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16748320#comment-16748320
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Graham Polley commented on BEAM-6474:
-------------------------------------
Doh! Of course. I didn't think to alias the commuted val/column.
Works now. Thanks Ken.
G
> Cannot reference field when using SqlTransform (need to use "EXPR$N" instead)
> -----------------------------------------------------------------------------
>
> Key: BEAM-6474
> URL: https://issues.apache.org/jira/browse/BEAM-6474
> Project: Beam
> Issue Type: Bug
> Components: dsl-sql
> Affects Versions: 2.9.0
> Environment: MacOS
> Reporter: Graham Polley
> Assignee: Graham Polley
> Priority: Minor
>
> Maybe I've done something wrong, but when you try to access a field this has
> been generated in a SqlTransform it throws an exception:
>
> {code:java}
> java.lang.RuntimeException: org.apache.beam.sdk.util.UserCodeException:
> java.lang.IllegalArgumentException: Cannot find field views in schema Fields:
> Field{name=wikimedia_project, description=, type=FieldType{typeName=STRING,
> collectionElementType=null, collectionElementTypeNullable=null,
> mapKeyType=null, mapValueType=null, mapValueTypeNullable=null,
> rowSchema=null, metadata=null}, nullable=false} Field{name=EXPR$1,
> description=, type=FieldType{typeName=INT32, collectionElementType=null,
> collectionElementTypeNullable=null, mapKeyType=null, mapValueType=null,
> mapValueTypeNullable=null, rowSchema=null, metadata=null},
> nullable=false}{code}
> Instead of being able to access the `views` field, it has been named `EXPR$1`
> by Beam/Dataflow. So, to get the value of the field I need to do this:
> {code:java}
> bqRow.set("views", row.getInt32("EXPR$1"));{code}
> instead of:
> {code:java}
> bqRow.set("views", row.getInt32("views"));{code}
>
> {code:java}
> PCollection<Row> outputStream =
> sqlRows.setRowSchema(SCHEMA)
> .apply("sql_transform",
> SqlTransform.query(
> "select wikimedia_project, sum(views) " +
> "from PCOLLECTION " +
> "group by wikimedia_project"));{code}
>
> Pipeline is reading a file from GCS, transforming it (using SqlTransform) and
> writing to BigQuery. Code can be found here:
> [https://github.com/polleyg/gcp-batch-ingestion-bigquery/blob/beam_sql/src/main/java/org/polleyg/TemplatePipeline.java]
>
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