Support reading decimal from BigQuery in Beam SQL
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bug
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sql
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Description
Right now BigQueryIO returns avro format data and Beam SQL parses it and convert to Row. More specifically, decimal value is saved into HeapByteBuffer
Need to investigate what's the way to convert from byte buffer to BigDecimal.
Imported from Jira [BEAM-4736](https://issues.apache.org/jira/browse/BEAM-4736). Original Jira may contain additional context.
Reported by: amaliujia.
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