Vladimir Steshin created IGNITE-24336: -----------------------------------------
Summary: 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 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( Arrays.asList(i, s + i), Arrays.asList(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)