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Vladimir Steshin updated IGNITE-24336: -------------------------------------- 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. -- This message was sent by Atlassian Jira (v8.20.10#820010)