org.apache.flink.table.sources

接口 FilterableTableSource<T>

已过时。

This interface will not be supported in the new source design around DynamicTableSource. Use SupportsFilterPushDown instead. See FLIP-95 for more information.

@Deprecated
public interface FilterableTableSource<T>

Adds support for filtering push-down to a TableSource. A TableSource extending this interface is able to filter records before returning.

方法概要

限定符和类型	方法和说明
TableSource<T>	applyPredicate(List<Expression> predicates) 已过时。 Check and pick all predicates this table source can support.
boolean	isFilterPushedDown() 已过时。 Return the flag to indicate whether filter push down has been tried.

方法详细资料

applyPredicate

TableSource<T> applyPredicate(List<Expression> predicates)

已过时。

Check and pick all predicates this table source can support. The passed in predicates have been translated in conjunctive form, and table source can only pick those predicates that it supports.

After trying to push predicates down, we should return a new TableSource instance which holds all pushed down predicates. Even if we actually pushed nothing down, it is recommended that we still return a new TableSource instance since we will mark the returned instance as filter push down has been tried.

We also should note to not changing the form of the predicates passed in. It has been organized in CNF conjunctive form, and we should only take or leave each element from the list. Don't try to reorganize the predicates if you are absolutely confident with that.

参数:

predicates - A list contains conjunctive predicates, you should pick and remove all expressions that can be pushed down. The remaining elements of this list will further evaluated by framework.

返回:

A new cloned instance of TableSource with or without any filters been pushed into it.

isFilterPushedDown

boolean isFilterPushedDown()

已过时。

Return the flag to indicate whether filter push down has been tried. Must return true on the returned instance of applyPredicate(java.util.List<org.apache.flink.table.expressions.Expression>).