Package dev.frostlake.executor

Class StarColumn

java.lang.Object

dev.frostlake.executor.StarColumn

public final class StarColumn
extends Object

One effective output column produced by expanding a SELECT * after its EXCLUDE / RENAME / REPLACE / ILIKE modifiers: the value expression to project, the output column name (RENAME changes it), the original source column name (to tell whether it was renamed), and a best-effort output data type.

Constructor Summary

Constructors

Constructor	Description
StarColumn(String expression, String outputName, String sourceName, DataType dataType)
StarColumn(String expression, String outputName, String sourceName, DataType dataType, boolean nullable)
StarColumn(String expression, String outputName, String sourceName, DataType dataType, boolean nullable, boolean nullabilityKnown)

Method Summary

Modifier and Type	Method	Description
DataType	getDataType()
String	getExpression()
String	getOutputName()
String	getSourceName()
boolean	isNullabilityKnown()	Whether the nullability above was read off a real column rather than defaulted — false for a REPLACE'd column, which projects an expression.
boolean	isNullable()	Whether the projected column accepts NULL — false only for a NOT NULL source column that the star projects as itself, since a REPLACE substitutes an expression.
boolean	isRenamed()	Whether the output name differs from the source column name (RENAME applied).

Methods inherited from class java.lang.Object

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

Constructor Details

StarColumn

public StarColumn(String expression,
 String outputName,
 String sourceName,
 DataType dataType)

StarColumn

public StarColumn(String expression,
 String outputName,
 String sourceName,
 DataType dataType,
 boolean nullable)

StarColumn

public StarColumn(String expression,
 String outputName,
 String sourceName,
 DataType dataType,
 boolean nullable,
 boolean nullabilityKnown)

Method Details

getExpression

public String getExpression()

getOutputName

public String getOutputName()

getSourceName

public String getSourceName()

getDataType

public DataType getDataType()

isNullable

public boolean isNullable()

Whether the projected column accepts NULL — false only for a NOT NULL source column that the star projects as itself, since a REPLACE substitutes an expression.

isNullabilityKnown

public boolean isNullabilityKnown()

Whether the nullability above was read off a real column rather than defaulted — false for a REPLACE'd column, which projects an expression.

isRenamed

public boolean isRenamed()

Whether the output name differs from the source column name (RENAME applied).