org.apache.flink.table.planner.expressions.converter

Class ExpressionConverter

java.lang.Object

org.apache.flink.table.planner.expressions.converter.ExpressionConverter

All Implemented Interfaces:

ExpressionVisitor<org.apache.calcite.rex.RexNode>

public class ExpressionConverter
extends Object
implements ExpressionVisitor<org.apache.calcite.rex.RexNode>

Visit expression to generator RexNode.

Constructor Summary

Constructors

Constructor and Description
ExpressionConverter(org.apache.calcite.tools.RelBuilder relBuilder)

Method Summary

Modifier and Type	Method and Description
static <T> T	extractValue(ValueLiteralExpression literal, Class<T> clazz) Extracts a value from a literal.
static List<org.apache.calcite.rex.RexNode>	toRexNodes(CallExpressionConvertRule.ConvertContext context, List<Expression> expr)
org.apache.calcite.rex.RexNode	visit(CallExpression call)
org.apache.calcite.rex.RexNode	visit(Expression other)
org.apache.calcite.rex.RexNode	visit(FieldReferenceExpression fieldReference)
org.apache.calcite.rex.RexNode	visit(TypeLiteralExpression typeLiteral)
org.apache.calcite.rex.RexNode	visit(ValueLiteralExpression valueLiteral)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ExpressionConverter

public ExpressionConverter(org.apache.calcite.tools.RelBuilder relBuilder)

Method Detail

visit

public org.apache.calcite.rex.RexNode visit(CallExpression call)

Specified by:

visit in interface ExpressionVisitor<org.apache.calcite.rex.RexNode>

visit

public org.apache.calcite.rex.RexNode visit(ValueLiteralExpression valueLiteral)

Specified by:

visit in interface ExpressionVisitor<org.apache.calcite.rex.RexNode>

visit

public org.apache.calcite.rex.RexNode visit(FieldReferenceExpression fieldReference)

Specified by:

visit in interface ExpressionVisitor<org.apache.calcite.rex.RexNode>

visit

public org.apache.calcite.rex.RexNode visit(TypeLiteralExpression typeLiteral)

Specified by:

visit in interface ExpressionVisitor<org.apache.calcite.rex.RexNode>

visit

public org.apache.calcite.rex.RexNode visit(Expression other)

Specified by:

visit in interface ExpressionVisitor<org.apache.calcite.rex.RexNode>

toRexNodes

public static List<org.apache.calcite.rex.RexNode> toRexNodes(CallExpressionConvertRule.ConvertContext context,
                                                              List<Expression> expr)

extractValue

public static <T> T extractValue(ValueLiteralExpression literal,
                                 Class<T> clazz)

Extracts a value from a literal. Including planner-specific instances such as DecimalData.