Package dev.frostlake.executor.expressions

Class ColumnReferenceExpression

java.lang.Object

dev.frostlake.executor.expressions.ColumnReferenceExpression

All Implemented Interfaces:

Expression

Direct Known Subclasses:

ConnectByRootExpression, PriorExpression

public class ColumnReferenceExpression
extends Object
implements Expression

Represents a column reference (e.g., "name", "users.id", "u.name")

Constructor Summary

Constructors

Constructor	Description
ColumnReferenceExpression(String columnName)
ColumnReferenceExpression(String tableName, String columnName)
ColumnReferenceExpression(String tableName, String columnName, SourcePosition position)	A reference that remembers where it sat in the text it was parsed from, so a message about it can carry the position Snowflake always reports.
ColumnReferenceExpression(String tableName, String columnName, SourcePosition position, int positionalOrdinal)	The $N flavour — see getPositionalOrdinal().

Method Summary

Modifier and Type	Method	Description
<T> T	accept(ExpressionVisitor<T> visitor)	Accept a visitor for the visitor pattern
void	describeStar(StarArgument star)	Marks this reference as the star argument star; see getStarArgument().
String	getColumnName()
SourcePosition	getPosition()	Where this reference sat in its fragment, or null when nobody wrote it.
int	getPositionalOrdinal()	N when this reference was written $N, 0 when it was written as a name.
StarArgument	getStarArgument()	The star — qualifier, EXCLUDE and ILIKE — when this reference is a star written beside other function arguments, which the evaluator splices into the list as the columns it names.
String	getTableName()
String	getWrittenName()	How this reference was written, or null when it was synthesised.
boolean	isQualified()
void	setWrittenName(String written)	Records the written spelling; see getWrittenName().
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Details

ColumnReferenceExpression

public ColumnReferenceExpression(String columnName)

ColumnReferenceExpression

public ColumnReferenceExpression(String tableName,
 String columnName)

ColumnReferenceExpression

public ColumnReferenceExpression(String tableName,
 String columnName,
 SourcePosition position)

A reference that remembers where it sat in the text it was parsed from, so a message about it can carry the position Snowflake always reports. See SourcePosition for why the place is fragment-relative and not absolute.

ColumnReferenceExpression

public ColumnReferenceExpression(String tableName,
 String columnName,
 SourcePosition position,
 int positionalOrdinal)

The $N flavour — see getPositionalOrdinal().

Method Details

getWrittenName

public String getWrittenName()

How this reference was written, or null when it was synthesised.

setWrittenName

public void setWrittenName(String written)

Records the written spelling; see getWrittenName().

getPositionalOrdinal

public int getPositionalOrdinal()

N when this reference was written $N, 0 when it was written as a name.

getPosition

public SourcePosition getPosition()

Where this reference sat in its fragment, or null when nobody wrote it.

getTableName

public String getTableName()

getColumnName

public String getColumnName()

isQualified

public boolean isQualified()

getStarArgument

public StarArgument getStarArgument()

The star — qualifier, EXCLUDE and ILIKE — when this reference is a star written beside other function arguments, which the evaluator splices into the list as the columns it names.

describeStar

public void describeStar(StarArgument star)

Marks this reference as the star argument star; see getStarArgument().

accept

public <T> T accept(ExpressionVisitor<T> visitor)

Description copied from interface: Expression

Accept a visitor for the visitor pattern

Specified by:

accept in interface Expression

toString

public String toString()

Overrides:

toString in class Object