Package org.apache.calcite.rel.externalize

Class RelJsonReader

java.lang.Object

org.apache.calcite.rel.externalize.RelJsonReader

public class RelJsonReader
extends Object

Reads a JSON plan and converts it back to a tree of relational expressions.

See Also:

• RelInput

Constructor Summary

Constructors

Constructor	Description
RelJsonReader(RelOptCluster cluster, RelOptSchema relOptSchema, Schema schema)
RelJsonReader(RelOptCluster cluster, RelOptSchema relOptSchema, Schema schema, UnaryOperator<RelJson> relJsonTransform)

Method Summary

Modifier and Type	Method	Description
RelNode	read(String s)
static RexNode	readRex(RelOptCluster typeFactory, String s)	Converts a JSON string (such as that produced by RelJson.toJson(RexNode)) into a Calcite expression.
static RelDataType	readType(RelDataTypeFactory typeFactory, String s)	Converts a JSON string (such as that produced by RelJson.toJson(Object)) into a Calcite type.

Methods inherited from class java.lang.Object

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

Constructor Details

RelJsonReader

public RelJsonReader(RelOptCluster cluster,
 RelOptSchema relOptSchema,
 Schema schema)

RelJsonReader

public RelJsonReader(RelOptCluster cluster,
 RelOptSchema relOptSchema,
 Schema schema,
 UnaryOperator<RelJson> relJsonTransform)

Method Details

read

public RelNode read(String s)
             throws IOException

Throws:

IOException

readType

public static RelDataType readType(RelDataTypeFactory typeFactory,
 String s)
                            throws IOException

Converts a JSON string (such as that produced by RelJson.toJson(Object)) into a Calcite type.

Throws:

IOException

readRex

public static RexNode readRex(RelOptCluster typeFactory,
 String s)
                       throws IOException

Converts a JSON string (such as that produced by RelJson.toJson(RexNode)) into a Calcite expression.

Throws:

IOException