Alireza Samadianzakaria created BEAM-7513:
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Summary: Row Estimation for BigQueryTable
Key: BEAM-7513
URL: https://issues.apache.org/jira/browse/BEAM-7513
Project: Beam
Issue Type: New Feature
Components: dsl-sql, io-java-gcp
Reporter: Alireza Samadianzakaria
Assignee: Alireza Samadianzakaria
Calcite tables (org.apache.calcite.schema.Table) should implement the method
org.apache.calcite.schema.Statistic getStatistic(). The Statistic instance
returned by this method is used for the Volcano optimizer in Calcite.
Currently, org.apache.beam.sdk.extensions.sql.impl.BeamCalciteTable has not
implemented getStatistic() which means it uses the implementation in
org.apache.calcite.schema.impl.AbstractTable and that implementation just
returns Statistics.UNKNOWN for all sources.
Things needed to be implemented:
1- Implementing getStatistic in BeamCalciteTable such that it calls a row count
estimation method from BeamSqlTable and adding this method to BeamSqlTable.
2- Implementing the row count estimation method for BigQueryTable.
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