Package net.hydromatic.morel.foreign

Class CalciteFunctions

java.lang.Object

net.hydromatic.morel.foreign.CalciteFunctions

public class CalciteFunctions
extends Object

Calcite table-valued user-defined function that evaluates a Morel expression and returns the result as a relation.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static interface	CalciteFunctions.Arg	Operand to a user-defined function.
static class	CalciteFunctions.Context	Execution context.
static class	CalciteFunctions.MorelApplyFunction	Calcite user-defined function that applies a Morel function (or closure) to an argument.
static class	CalciteFunctions.MorelScalarFunction	Calcite user-defined function that evaluates a Morel string and returns a scalar value.
static class	CalciteFunctions.MorelTableFunction	Calcite user-defined function that evaluates a Morel string and returns a table.

Field Summary

Fields

Modifier and Type	Field	Description
static final org.apache.calcite.sql.SqlOperator	APPLY_OPERATOR
static final org.apache.calcite.sql.SqlOperator	SCALAR_OPERATOR
static final org.apache.calcite.sql.SqlOperator	TABLE_OPERATOR
static final ThreadLocal<CalciteFunctions.Context>	THREAD_ENV
static final ThreadLocal<EvalEnv>	THREAD_EVAL_ENV	Used to pass Morel's evaluation environment into Calcite, so that it is available if Calcite calls back into Morel.

Constructor Summary

Constructors

Modifier	Constructor	Description
private	CalciteFunctions()

Method Summary

Modifier and Type	Method	Description
private static org.apache.calcite.rel.type.RelDataType	inferReturnType(org.apache.calcite.sql.SqlOperatorBinding b)

Methods inherited from class java.lang.Object

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

Field Details

THREAD_ENV

public static final ThreadLocal<CalciteFunctions.Context> THREAD_ENV

THREAD_EVAL_ENV

public static final ThreadLocal<EvalEnv> THREAD_EVAL_ENV

Used to pass Morel's evaluation environment into Calcite, so that it is available if Calcite calls back into Morel.

It would be better if we passed the environment, or variables we know are needed, as an argument at the Calcite-to-Morel (see Calcite.code(net.hydromatic.morel.compile.Environment, org.apache.calcite.rel.RelNode, net.hydromatic.morel.type.Type)) and Morel-to-Calcite (see TABLE_OPERATOR and SCALAR_OPERATOR) boundaries.

TABLE_OPERATOR

public static final org.apache.calcite.sql.SqlOperator TABLE_OPERATOR

SCALAR_OPERATOR

public static final org.apache.calcite.sql.SqlOperator SCALAR_OPERATOR

APPLY_OPERATOR

public static final org.apache.calcite.sql.SqlOperator APPLY_OPERATOR

Constructor Details

CalciteFunctions

private CalciteFunctions()

Method Details

inferReturnType

private static org.apache.calcite.rel.type.RelDataType inferReturnType(org.apache.calcite.sql.SqlOperatorBinding b)