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https://issues.apache.org/jira/browse/IGNITE-24336?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vladimir Steshin updated IGNITE-24336:
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Labels: calcite ignite-2 ise sql (was: )
> Calcite. Add support of user-defined table functions.
> -----------------------------------------------------
>
> Key: IGNITE-24336
> URL: https://issues.apache.org/jira/browse/IGNITE-24336
> Project: Ignite
> Issue Type: Improvement
> Reporter: Vladimir Steshin
> Assignee: Vladimir Steshin
> Priority: Major
> Labels: calcite, ignite-2, ise, sql
>
> We should implement user-defined table functions. They also have a
> implementation in Calcite, `_TableFunctionImpl_`. And we also have
> user-defined scalar functions.
> Table functions should be described similarly to the existing configuration
> of scalar functions, via `_CacheConfiguration#setSqlFunctionClasses()_` and
> annotation `_@QuerySqlTableFunction_`. Or we might use another annotation.
> The annotation should describe the returned columns and their data types.
> *Example:*
> {code:java}
> public static final class IncorrectTableFunctionsLibrary {
> @QuerySqlFunction(tableColumnTypes = {Integer.class, String.class},
> tableColumnNames = {"INT_COL", "STR_COL"})
> public static Iterable duplicateColumnName(int i, String s) {
> return Arrays.asList(
> new Object[]{i, s + i},
> new Object[]{i * 10, s + (i * 10)}
> );
> }
> }
> {code}
> Table function implementation must return an `Iterable` representing table
> rows. Each its element is an `_Object[]_` or an `_Iterable_` representing a
> table row. The number of row elements must match the number of the defined
> columns.
> *Known limitations:*
> Only _Calcite_ engine will support table functions first.
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