gudusoft.gsqlparser.resolver2.namespace

Class LateralViewNamespace

Object

gudusoft.gsqlparser.resolver2.namespace.AbstractNamespace

gudusoft.gsqlparser.resolver2.namespace.LateralViewNamespace

All Implemented Interfaces:

INamespace

public class LateralViewNamespace
extends AbstractNamespace

The relation a Hive-family LATERAL VIEW adds to its SELECT: lv in FROM events LATERAL VIEW explode(items) lv AS item, with the columns its column aliases name, item. A reference to one of them, lv.item, item or a field of it, lv.item.name, resolves to this relation (Mantis 4845). The parser gives the LATERAL VIEW a table of type ETableSource.lateralView that shares its alias clause (TLateralView.createATable).

Field Summary

Fields inherited from class gudusoft.gsqlparser.resolver2.namespace.AbstractNamespace

columnSources, columnSourcesWithRefs, guessColumnStrategy, nameMatcher, node, referenceTraceabilityEnabled, validated

Constructor Summary

Constructors

Constructor and Description
LateralViewNamespace(TTable table, String alias, TObjectNameList columns, INameMatcher nameMatcher) columns: the LATERAL VIEW's column aliases, item in lv AS item; null for none.

Method Summary

Modifier and Type	Method and Description
protected void	doValidate() Subclasses override this to perform actual validation logic.
List<TTable>	getAllFinalTables() Get all final physical tables this namespace depends on.
String	getDisplayName() Get a display name for this namespace (for debugging/error messages)
TTable	getFinalTable() Get the final physical table this namespace represents.
TTable	getSourceTable() The LATERAL VIEW's own table: the source table of a column resolved through it.
TTable	getTable()
ColumnLevel	hasColumn(String columnName) Check if a column exists in this namespace.
boolean	hasStarColumn() Check if this namespace contains a star column (SELECT *).
ColumnSource	resolveColumn(String columnName) Resolve a column name to its source.
boolean	supportsDynamicInference() Check if this namespace supports dynamic column inference.
String	toString()

Methods inherited from class gudusoft.gsqlparser.resolver2.namespace.AbstractNamespace

addColumnSource, addColumnSource, containsColumnByMatcher, containsColumnNameByMatcher, enableReferenceTraceability, ensureValidated, findColumnKeyByMatcher, getAllColumnSources, getAllUniqueColumns, getColumnReferences, getColumnSourceWithReferences, getGuessColumnStrategy, getNameMatcher, getNode, isReferenceTraceabilityEnabled, isValidated, noteColumnSourceAdded, setGuessColumnStrategy, validate

Methods inherited from class Object

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

Methods inherited from interface gudusoft.gsqlparser.resolver2.namespace.INamespace

addInferredColumn, getInferredColumns, getMetadataState, getSelectStatement, getStarColumn, hasAuthoritativeOutputColumn, resolveColumnPath

Constructor Detail

LateralViewNamespace

public LateralViewNamespace(TTable table,
                            String alias,
                            TObjectNameList columns,
                            INameMatcher nameMatcher)

columns: the LATERAL VIEW's column aliases, item in lv AS item; null for none.

Method Detail

getDisplayName

public String getDisplayName()

Description copied from interface: INamespace

Get a display name for this namespace (for debugging/error messages)

getFinalTable

public TTable getFinalTable()

Description copied from interface: INamespace

Get the final physical table this namespace represents. For tables: returns the table itself For subqueries/CTEs: recursively traces back to physical table(s)

Returns:

Physical table, or null if not determinable

getAllFinalTables

public List<TTable> getAllFinalTables()

Description copied from interface: INamespace

Get all final physical tables this namespace depends on. For simple table namespace: returns single table For subquery/CTE: returns all tables in the query tree

Specified by:

getAllFinalTables in interface INamespace

Overrides:

getAllFinalTables in class AbstractNamespace

Returns:

List of all physical tables

doValidate

protected void doValidate()

Description copied from class: AbstractNamespace

Subclasses override this to perform actual validation logic.

Specified by:

doValidate in class AbstractNamespace

hasStarColumn

public boolean hasStarColumn()

Description copied from interface: INamespace

Check if this namespace contains a star column (SELECT *). Used to identify namespaces that may need star column inference.

Returns:

true if the namespace has SELECT *, false otherwise

supportsDynamicInference

public boolean supportsDynamicInference()

Description copied from interface: INamespace

Check if this namespace supports dynamic column inference. DynamicStarSource and similar namespaces return true.

Returns:

true if this namespace can have columns added dynamically

hasColumn

public ColumnLevel hasColumn(String columnName)

Description copied from interface: INamespace

Check if a column exists in this namespace. Returns a three-level answer: EXISTS, MAYBE, NOT_EXISTS

Specified by:

hasColumn in interface INamespace

Overrides:

hasColumn in class AbstractNamespace

Parameters:

columnName - Column name to check

Returns:

Column existence level

resolveColumn

public ColumnSource resolveColumn(String columnName)

Description copied from interface: INamespace

Resolve a column name to its source.

Specified by:

resolveColumn in interface INamespace

Overrides:

resolveColumn in class AbstractNamespace

Parameters:

columnName - Column name to resolve

Returns:

ColumnSource if found, null otherwise

getTable

public TTable getTable()

getSourceTable

public TTable getSourceTable()

The LATERAL VIEW's own table: the source table of a column resolved through it.

Returns:

The source TTable, or null if not applicable

toString

public String toString()

Overrides:

toString in class AbstractNamespace