Package org.apache.druid.math.expr

Class InputBindings

java.lang.Object

org.apache.druid.math.expr.InputBindings

public class InputBindings
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	InputBindings.BestEffortInputBindings	Expr.ObjectBinding backed by a cache populated by ExprEval.bestEffortOf(Object) for when the input type information is totally unknown, for a single row worth of values.
static class	InputBindings.InputSupplier<T>

Constructor Summary

Constructors

Constructor	Description
InputBindings()

Method Summary

Modifier and Type	Method	Description
static Expr.ObjectBinding	forInputSupplier(String supplierName, ExpressionType type, com.google.common.base.Supplier<?> supplier)	Create a Expr.ObjectBinding for a single input value of a known type provided by some Supplier
static Expr.ObjectBinding	forInputSupplier(ExpressionType type, com.google.common.base.Supplier<?> supplier)	Create a Expr.ObjectBinding for a single input value of a known type provided by some Supplier
static Expr.ObjectBinding	forInputSuppliers(Map<String,InputBindings.InputSupplier<?>> bindings)	Create Expr.ObjectBinding backed by map of Supplier to provide values for identifiers to evaluate Expr
static Expr.ObjectBinding	forMap(Map<String,?> bindings)	Deprecated.
static Expr.ObjectBinding	forMap(Map<String,?> bindings, Expr.InputBindingInspector inspector)	Create Expr.ObjectBinding backed by Map to provide values for identifiers to evaluate Expr Types are detected and values are coereced via ExprEval.bestEffortOf(Object) because input types are currently unknown.
static Expr.ObjectBinding	forRow(Row row)	Creates a Expr.ObjectBinding backed by some Row.
static <T> InputBindings.InputSupplier<T>	inputSupplier(ExpressionType type, com.google.common.base.Supplier<T> supplier)
static Expr.InputBindingInspector	inspectorForColumn(String column, ExpressionType type)
static Expr.InputBindingInspector	inspectorFromTypeMap(Map<String,ExpressionType> types)	Create an Expr.InputBindingInspector backed by a map of binding identifiers to their ExprType
static Expr.ObjectBinding	nilBindings()	Empty Expr.ObjectBinding that doesn't complain about attempts to access type or value for any input identifiers, both of which will be nulls.
static Expr.ObjectBinding	validateConstant(Expr expr)	Empty binding that throw a UOE if anything attempts to lookup an identifier type or value

Methods inherited from class java.lang.Object

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

Constructor Detail

InputBindings

public InputBindings()

Method Detail

nilBindings

public static Expr.ObjectBinding nilBindings()

Empty Expr.ObjectBinding that doesn't complain about attempts to access type or value for any input identifiers, both of which will be nulls. Typically used for evaluating known constant expressions, or finding a default or initial value of some expression if all inputs are null.

validateConstant

public static Expr.ObjectBinding validateConstant(Expr expr)

Empty binding that throw a UOE if anything attempts to lookup an identifier type or value

inspectorFromTypeMap

public static Expr.InputBindingInspector inspectorFromTypeMap(Map<String,ExpressionType> types)

Create an Expr.InputBindingInspector backed by a map of binding identifiers to their ExprType

inspectorForColumn

public static Expr.InputBindingInspector inspectorForColumn(String column,
                                                            ExpressionType type)

forRow

public static Expr.ObjectBinding forRow(Row row)

Creates a Expr.ObjectBinding backed by some Row. ColumnHolder.TIME_COLUMN_NAME is special handled to be backed by Row.getTimestampFromEpoch(), all other values are ethically sourced from Row.getRaw(String). Types are detected and values are coereced via ExprEval.bestEffortOf(Object) because input types are currently unknown.

forMap

@Deprecated
public static Expr.ObjectBinding forMap(Map<String,?> bindings)

Deprecated.

Create Expr.ObjectBinding backed by Map to provide values for identifiers to evaluate Expr Types are detected and values are coereced via ExprEval.bestEffortOf(Object) because input types are currently unknown. This method is only used for testing and mimics the behavior of forRow(Row) except lacks special handling for columns named ColumnHolder.TIME_COLUMN_NAME.

forMap

public static Expr.ObjectBinding forMap(Map<String,?> bindings,
                                        Expr.InputBindingInspector inspector)

Create Expr.ObjectBinding backed by Map to provide values for identifiers to evaluate Expr Types are detected and values are coereced via ExprEval.bestEffortOf(Object) because input types are currently unknown.

forInputSupplier

public static Expr.ObjectBinding forInputSupplier(ExpressionType type,
                                                  com.google.common.base.Supplier<?> supplier)

Create a Expr.ObjectBinding for a single input value of a known type provided by some Supplier

forInputSupplier

public static Expr.ObjectBinding forInputSupplier(String supplierName,
                                                  ExpressionType type,
                                                  com.google.common.base.Supplier<?> supplier)

Create a Expr.ObjectBinding for a single input value of a known type provided by some Supplier

inputSupplier

public static <T> InputBindings.InputSupplier<T> inputSupplier(ExpressionType type,
                                                               com.google.common.base.Supplier<T> supplier)

forInputSuppliers

public static Expr.ObjectBinding forInputSuppliers(Map<String,InputBindings.InputSupplier<?>> bindings)

Create Expr.ObjectBinding backed by map of Supplier to provide values for identifiers to evaluate Expr