[
https://issues.apache.org/jira/browse/IGNITE-24336?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Vladimir Steshin updated IGNITE-24336:
--------------------------------------
Description:
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 TableFunctions {
@QuerySqlFunction(tableColumnTypes = {Integer.class, String.class},
tableColumnNames = {"INT_COL", "STR_COL"})
public static Iterable table_fun(int i) {
return Arrays.asList(
new Object[]{i, "code_" + i},
new Object[]{i * 10, "code_" + (i * 10)}
);
}
}
IgniteCache<?, ?> emp = ignite.getOrCreateCache(new
CacheConfiguration("test_cache")
.setSqlFunctionClasses(TableFunctions.class)
);
sql("select STR_COL from TABLE_FUN(1) where INT_COL>1")
{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.
was:
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 table_fun(int i) {
return Arrays.asList(
new Object[]{i, "code_" + i},
new Object[]{i * 10, "code_" + (i * 10)}
);
}
}
sql("select STR_COL from TABLE_FUN(1) where INT_COL>1")
{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.
> 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 TableFunctions {
> @QuerySqlFunction(tableColumnTypes = {Integer.class, String.class},
> tableColumnNames = {"INT_COL", "STR_COL"})
> public static Iterable table_fun(int i) {
> return Arrays.asList(
> new Object[]{i, "code_" + i},
> new Object[]{i * 10, "code_" + (i * 10)}
> );
> }
> }
> IgniteCache<?, ?> emp = ignite.getOrCreateCache(new
> CacheConfiguration("test_cache")
> .setSqlFunctionClasses(TableFunctions.class)
> );
> sql("select STR_COL from TABLE_FUN(1) where INT_COL>1")
> {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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