CollectNamespace (Apache Calcite API)

java.lang.Object
- org.apache.calcite.sql.validate.AbstractNamespace
- - org.apache.calcite.sql.validate.CollectNamespace

All Implemented Interfaces:

SqlValidatorNamespace
```
public class CollectNamespace
extends AbstractNamespace
```
Namespace for COLLECT and TABLE constructs.
Examples:
- SELECT deptno, COLLECT(empno) FROM emp GROUP BY deptno,
- SELECT * FROM (TABLE getEmpsInDept(30)).
NOTE: jhyde, 2006/4/24: These days, this class seems to be used exclusively for the MULTISET construct.
See Also:

CollectScope

Field Summary

Fields
Modifier and Type Field Description

private SqlCall child

private SqlValidatorScope scope
- Fields inherited from class org.apache.calcite.sql.validate.AbstractNamespace
  enclosingNode, rowType, type, validator

Constructor Summary

Constructors
Constructor Description

CollectNamespace(SqlCall child, SqlValidatorScope scope, SqlNode enclosingNode)
Creates a CollectNamespace.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`SqlNode`	`getNode()`	Returns the parse tree node at the root of this namespace.
`SqlValidatorScope`	`getScope()`
`protected RelDataType`	`validateImpl(RelDataType targetRowType)`	Validates this scope and returns the type of the records it returns.

Methods inherited from class org.apache.calcite.sql.validate.AbstractNamespace
convertToStruct, fieldExists, getEnclosingNode, getMonotonicExprs, getMonotonicity, getRowType, getRowTypeSansSystemColumns, getTable, getType, getValidator, isWrapperFor, lookupChild, makeNullable, resolve, setType, supportsModality, toStruct, translate, unwrap, validate

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - child
```
private final SqlCall child
```
  - scope
```
private final SqlValidatorScope scope
```
- Constructor Detail
  - CollectNamespace
```
CollectNamespace(SqlCall child,
                 SqlValidatorScope scope,
                 SqlNode enclosingNode)
```
    Creates a CollectNamespace.
    
    Parameters:
    
    child - Parse tree node
    
    scope - Scope
    
    enclosingNode - Enclosing parse tree node
- Method Detail
  - validateImpl
```
protected RelDataType validateImpl(RelDataType targetRowType)
```
    Description copied from class: AbstractNamespace
    
    Validates this scope and returns the type of the records it returns. External users should call AbstractNamespace.validate(org.apache.calcite.rel.type.RelDataType), which uses the AbstractNamespace.status field to protect against cycles.
    
    Specified by:
    
    validateImpl in class AbstractNamespace
    
    Parameters:
    
    targetRowType - Desired row type, must not be null, may be the data type 'unknown'.
    
    Returns:
    
    record data type, never null
  - getNode
```
public SqlNode getNode()
```
    Description copied from interface: SqlValidatorNamespace
    
    Returns the parse tree node at the root of this namespace.
    
    Returns:
    
    parse tree node; null for TableNamespace
  - getScope
```
public SqlValidatorScope getScope()
```