gudusoft.gsqlparser.resolver2.expansion

Class ExpandedColumn

Object

gudusoft.gsqlparser.resolver2.expansion.ExpandedColumn

public class ExpandedColumn
extends Object

Represents a column expanded from a star (*) column.

When SELECT * is expanded, each column from the source tables becomes an ExpandedColumn. This class tracks: - The column name - The original star column it came from - The source (which table/namespace) - Whether to include table qualifier

Example:

 SELECT * FROM employees
 -- Expands to:
 ExpandedColumn("id", employees.id, *, true)
 ExpandedColumn("name", employees.name, *, true)
 ExpandedColumn("salary", employees.salary, *, true)
 

Constructor Summary

Constructors

Constructor and Description
ExpandedColumn(String columnName, ColumnSource columnSource, TResultColumn originalStarColumn, boolean includeQualifier) Create an expanded column from an unqualified star.
ExpandedColumn(String columnName, ColumnSource columnSource, TResultColumn originalStarColumn, String tableQualifier, boolean includeQualifier) Create an expanded column from a qualified star (e.g., t1.*).

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object obj)
String	getColumnName()
ColumnSource	getColumnSource()
double	getConfidence() Get the confidence score for this expanded column.
TResultColumn	getOriginalStarColumn()
String	getQualifiedName() Get the fully qualified column name (e.g., "t1.id").
String	getTableQualifier()
String	getUnqualifiedName() Get the column name without qualifier.
int	hashCode()
boolean	isQualified()
String	toString()

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

ExpandedColumn

public ExpandedColumn(String columnName,
                      ColumnSource columnSource,
                      TResultColumn originalStarColumn,
                      boolean includeQualifier)

Create an expanded column from an unqualified star.

Parameters:

columnName - the column name

columnSource - the column source

originalStarColumn - the original star column

includeQualifier - whether to include table qualifier

ExpandedColumn

public ExpandedColumn(String columnName,
                      ColumnSource columnSource,
                      TResultColumn originalStarColumn,
                      String tableQualifier,
                      boolean includeQualifier)

Create an expanded column from a qualified star (e.g., t1.*).

Parameters:

columnName - the column name

columnSource - the column source

originalStarColumn - the original star column

tableQualifier - the table qualifier (e.g., "t1")

includeQualifier - whether to include table qualifier

Method Detail

getColumnName

public String getColumnName()

getColumnSource

public ColumnSource getColumnSource()

getOriginalStarColumn

public TResultColumn getOriginalStarColumn()

getTableQualifier

public String getTableQualifier()

isQualified

public boolean isQualified()

getQualifiedName

public String getQualifiedName()

Get the fully qualified column name (e.g., "t1.id").

Returns:

qualified name if qualifier is set, otherwise just column name

getUnqualifiedName

public String getUnqualifiedName()

Get the column name without qualifier.

Returns:

unqualified column name

getConfidence

public double getConfidence()

Get the confidence score for this expanded column.

Returns:

confidence [0.0, 1.0], or 1.0 if no source available

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object