water.rapids

Class ASTGroup

java.lang.Object

water.Iced<AST>

water.rapids.AST

water.rapids.ASTGroup

All Implemented Interfaces:

java.io.Externalizable, java.io.Serializable, java.lang.Cloneable, Freezable<AST>

public class ASTGroup
extends AST

GroupBy Group the rows of 'data' by unique combinations of '[group-by-cols]'. Apply function 'fcn' to a Frame for each group, with a single column argument, and a NA-handling flag. Sets of tuples {fun,col,na} are allowed. 'fcn' must be a one of a small set of functions, all reductions, and 'GB' returns a row per unique group, with the first columns being the grouping columns, and the last column(s) the reduction result(s). The returned column(s).

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ASTGroup.AGG
static class	ASTGroup.FCN
static class	ASTGroup.G
static class	ASTGroup.GBTask
static class	ASTGroup.NAHandling

Constructor Summary

Constructors

Constructor and Description
ASTGroup()

Method Summary

Methods

Modifier and Type	Method and Description
Val	apply(Env env, water.rapids.Env.StackHelp stk, AST[] asts)
java.lang.String[]	args()
Val	exec(Env env)
java.lang.String	str()

Methods inherited from class water.rapids.AST

newASTFrame, newASTStr, toString

Methods inherited from class water.Iced

asBytes, clone, copyOver, frozenType, read, readExternal, readJSON, reloadFromBytes, toJsonString, write, writeExternal, writeJSON

Methods inherited from class java.lang.Object

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

Constructor Detail

ASTGroup

public ASTGroup()

Method Detail

args

public java.lang.String[] args()

str

public java.lang.String str()

Specified by:

str in class AST

apply

public Val apply(Env env,
        water.rapids.Env.StackHelp stk,
        AST[] asts)

Overrides:

apply in class AST

exec

public Val exec(Env env)

Specified by:

exec in class AST