feat: example on optimizing with calcite'#776
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mbwhite wants to merge 3 commits intosubstrait-io:mainfrom
Open
feat: example on optimizing with calcite'#776mbwhite wants to merge 3 commits intosubstrait-io:mainfrom
mbwhite wants to merge 3 commits intosubstrait-io:mainfrom
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Signed-off-by: MBWhite <whitemat@uk.ibm.com>
Signed-off-by: MBWhite <whitemat@uk.ibm.com>
nielspardon
reviewed
Apr 14, 2026
| * <p>This example follows the same structure as the "ToSql" example but shows how the | ||
| * ConverterProvider can be subclassed to update the Calcite configuration. | ||
| * | ||
| * <p>This case how the HepPlanner can be used to optimize the plan before it's conversion to SQL. |
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| * <p>This case how the HepPlanner can be used to optimize the plan before it's conversion to SQL. | |
| * <p>This shows how the HepPlanner can be used to optimize the plan before it's conversion to SQL. |
nielspardon
reviewed
Apr 14, 2026
| static final class OptimizingConverterProvider extends ConverterProvider { | ||
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| /** | ||
| * Set of calcite rules to use. |
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| * Set of calcite rules to use. | |
| * Set of Calcite rules to use. |
nielspardon
reviewed
Apr 14, 2026
| .addRuleCollection(simplificationRules()); | ||
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| final RelOptPlanner hepPlanner = new HepPlanner(programBuilder.build()); | ||
| // convert the substrait to the calcite relation tree |
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| // convert the substrait to the calcite relation tree | |
| // convert the Substrait to the Calcite relation tree |
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An example of how the ConverterProvider can be subclassed to inject custom calcite behaviour. In this case how the Calcite HepPlanner can be used to optimize the query plan before conversion to SQL.
note this is the cleanest way I could find to implement this.