chunyang opened a new pull request #17153:
URL: https://github.com/apache/beam/pull/17153


   Second attempt to avoid storing generator in _CustomBigQuerySource. See 
description from last attempt (#17100) below.
   
   This time, export table schema is retrieved before the temp dataset is 
deleted. Because TableSchema is not picklable (see 
https://github.com/apache/beam/pull/17100#issuecomment-1075505398), I convert 
it into a JSON string before storing it as an instance variable.
   
   ------------------------
   Avoid storing a generator in _CustomBigQuerySource so that it can be used 
with the Python interactive runner. See details in 
https://issues.apache.org/jira/browse/BEAM-14112 .
   
   Likely related to https://github.com/apache/beam/pull/15610
   
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