org.apache.flink.table.planner.plan.rules.logical

Class PushFilterIntoSourceScanRuleBase

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.flink.table.planner.plan.rules.logical.PushFilterIntoSourceScanRuleBase

Direct Known Subclasses:

PushFilterInCalcIntoTableSourceScanRule, PushFilterIntoTableSourceScanRule

public abstract class PushFilterIntoSourceScanRuleBase
extends org.apache.calcite.plan.RelOptRule

Base class for rules that push down filters into table scan.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.calcite.plan.RelOptRule

org.apache.calcite.plan.RelOptRule.ConverterRelOptRuleOperand

Field Summary

Fields inherited from class org.apache.calcite.plan.RelOptRule

description, operands, relBuilderFactory

Constructor Summary

Constructors

Constructor and Description
PushFilterIntoSourceScanRuleBase(org.apache.calcite.plan.RelOptRuleOperand operand, String description)

Method Summary

Modifier and Type	Method and Description
protected boolean	canPushdownFilter(org.apache.flink.table.planner.plan.schema.TableSourceTable tableSourceTable) Determines wether we can pushdown the filter into the source.
protected List<org.apache.calcite.rex.RexNode>	convertExpressionToRexNode(List<ResolvedExpression> expressions, RelBuilder relBuilder)
protected org.apache.calcite.rex.RexNode	createRemainingCondition(RelBuilder relBuilder, List<ResolvedExpression> expressions, org.apache.calcite.rex.RexNode[] unconvertedPredicates)
boolean	matches(org.apache.calcite.plan.RelOptRuleCall call)
protected scala.Tuple2<SupportsFilterPushDown.Result,org.apache.flink.table.planner.plan.schema.TableSourceTable>	resolveFiltersAndCreateTableSourceTable(org.apache.calcite.rex.RexNode[] convertiblePredicates, org.apache.flink.table.planner.plan.schema.TableSourceTable oldTableSourceTable, org.apache.calcite.rel.core.TableScan scan, RelBuilder relBuilder) Resolves filters using the underlying sources SupportsFilterPushDown and creates a new TableSourceTable with the supplied predicates.

Methods inherited from class org.apache.calcite.plan.RelOptRule

any, convert, convert, convertList, convertOperand, convertOperand, equals, equals, getOperand, getOperands, getOutConvention, getOutTrait, hashCode, none, onMatch, operand, operand, operand, operand, operand, operandJ, operandJ, some, toString, unordered

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

PushFilterIntoSourceScanRuleBase

public PushFilterIntoSourceScanRuleBase(org.apache.calcite.plan.RelOptRuleOperand operand,
                                        String description)

Method Detail

matches

public boolean matches(org.apache.calcite.plan.RelOptRuleCall call)

Overrides:

matches in class org.apache.calcite.plan.RelOptRule

convertExpressionToRexNode

protected List<org.apache.calcite.rex.RexNode> convertExpressionToRexNode(List<ResolvedExpression> expressions,
                                                                          RelBuilder relBuilder)

createRemainingCondition

protected org.apache.calcite.rex.RexNode createRemainingCondition(RelBuilder relBuilder,
                                                                  List<ResolvedExpression> expressions,
                                                                  org.apache.calcite.rex.RexNode[] unconvertedPredicates)

resolveFiltersAndCreateTableSourceTable

protected scala.Tuple2<SupportsFilterPushDown.Result,org.apache.flink.table.planner.plan.schema.TableSourceTable> resolveFiltersAndCreateTableSourceTable(org.apache.calcite.rex.RexNode[] convertiblePredicates,
                                                                                                                                                          org.apache.flink.table.planner.plan.schema.TableSourceTable oldTableSourceTable,
                                                                                                                                                          org.apache.calcite.rel.core.TableScan scan,
                                                                                                                                                          RelBuilder relBuilder)

Resolves filters using the underlying sources SupportsFilterPushDown and creates a new TableSourceTable with the supplied predicates.

Parameters:

convertiblePredicates - Predicates to resolve

oldTableSourceTable - TableSourceTable to copy

scan - Underlying table scan to push to

relBuilder - Builder to push the scan to

Returns:

A tuple, constituting of the resolved filters and the newly created TableSourceTable

canPushdownFilter

protected boolean canPushdownFilter(org.apache.flink.table.planner.plan.schema.TableSourceTable tableSourceTable)

Determines wether we can pushdown the filter into the source. we can not push filter twice, make sure FilterPushDownSpec has not been assigned as a capability.

Parameters:

tableSourceTable - Table scan to attempt to push into

Returns:

Whether we can push or not