Graham Polley created BEAM-6474:
-----------------------------------
Summary: 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: beam-model, dsl-sql, runner-dataflow
Affects Versions: 2.9.0
Environment: MacOS
Reporter: Graham Polley
Assignee: Kenneth Knowles
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}
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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