Package org.apache.flink.table.planner.calcite

Class SqlToRexConverter

java.lang.Object

org.apache.flink.table.planner.calcite.SqlToRexConverter

@Internal
public class SqlToRexConverter
extends Object

Converts SQL expressions to RexNode.

Constructor Summary

Constructors

Constructor	Description
SqlToRexConverter(org.apache.flink.table.planner.calcite.FlinkPlannerImpl planner, org.apache.calcite.sql.SqlDialect sqlDialect, org.apache.calcite.rel.type.RelDataType inputRowType, org.apache.calcite.rel.type.RelDataType outputType)

Method Summary

Modifier and Type	Method	Description
org.apache.calcite.rex.RexNode	convertToRexNode(String expr)	Converts a SQL expression to a RexNode expression.
org.apache.calcite.rex.RexNode	convertToRexNode(org.apache.calcite.sql.SqlNode sqlNode)	Converts a SqlNode to a RexNode expression.
org.apache.calcite.rex.RexNode[]	convertToRexNodes(String[] exprs)	Converts an array of SQL expressions to an array of RexNode expressions.
String	expand(String expr)	Converts the given SQL expression string to an expanded string with fully qualified function calls and escaped identifiers.

Methods inherited from class java.lang.Object

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

Constructor Detail

SqlToRexConverter

public SqlToRexConverter(org.apache.flink.table.planner.calcite.FlinkPlannerImpl planner,
                         org.apache.calcite.sql.SqlDialect sqlDialect,
                         org.apache.calcite.rel.type.RelDataType inputRowType,
                         @Nullable
                         org.apache.calcite.rel.type.RelDataType outputType)

Method Detail

expand

public String expand(String expr)

Converts the given SQL expression string to an expanded string with fully qualified function calls and escaped identifiers.

E.g. my_udf(f0) + 1 to `my_catalog`.`my_database`.`my_udf`(`f0`) + 1

convertToRexNode

public org.apache.calcite.rex.RexNode convertToRexNode(String expr)

Converts a SQL expression to a RexNode expression.

Parameters:

expr - SQL expression e.g. `my_catalog`.`my_database`.`my_udf`(`f0`) + 1

convertToRexNode

public org.apache.calcite.rex.RexNode convertToRexNode(org.apache.calcite.sql.SqlNode sqlNode)

Converts a SqlNode to a RexNode expression.

convertToRexNodes

public org.apache.calcite.rex.RexNode[] convertToRexNodes(String[] exprs)

Converts an array of SQL expressions to an array of RexNode expressions.

Parameters:

exprs - SQL expression e.g. `my_catalog`.`my_database`.`my_udf`(`f0`) + 1