Class ColumnReference

Reference to a named (computed) column in some table.

Inheritance
Object
Expression
Expression<ColumnReference, Table>
ColumnReference
Inherited Members
Namespace: Mangrove.MetricSetSyntaxTree.ExpressionNodes
Assembly: MetricSetSyntaxTree.dll
Syntax
public class ColumnReference : Expression<ColumnReference, Table>, IVisitable<IExpressionVisitor>, ICloneable<ColumnReference, Table, Expression>, ICloneable<Expression>, IDirectedAcyclicGraph<Expression>
Remarks

For example, if a metric set contains a computed column called C := A + B, it would appear as a ColumnReference, with the expression A + B for the column expression.

Constructors

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ColumnReference(DataSourceColumn)

Create a column reference wrapping a data source column.

Declaration
public ColumnReference(DataSourceColumn expr)
Parameters
Type Name Description
DataSourceColumn expr
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ColumnReference(Table, String, Expression, IReadOnlyDictionary<String, String>)

Declaration
[JsonConstructor]
public ColumnReference(Table table, string columnName, Expression columnExpression, IReadOnlyDictionary<string, string> metadata = null)
Parameters
Type Name Description
Table table
String columnName
Expression columnExpression
IReadOnlyDictionary<String, String> metadata

Properties

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ColumnExpression

Expression that this named column is defined to be.

Declaration
public Expression ColumnExpression { get; set; }
Property Value
Type Description
Expression
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ColumnName

Name (within the table) of this column.

Declaration
public string ColumnName { get; }
Property Value
Type Description
String
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Metadata

Unstructured metadata (e.g., "cache this" for a column) for this expression.

Declaration
public IReadOnlyDictionary<string, string> Metadata { get; }
Property Value
Type Description
IReadOnlyDictionary<String, String>
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Parents

Declaration
[JsonIgnore]
public override IReadOnlyList<Expression> Parents { get; }
Property Value
Type Description
IReadOnlyList<Expression>
Overrides

Methods

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Accept(IExpressionVisitor)

Declaration
public override void Accept(IExpressionVisitor visitor)
Parameters
Type Name Description
IExpressionVisitor visitor
Overrides
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Clone(Table, IReadOnlyList<Expression>)

Declaration
public override ColumnReference Clone(Table table, IReadOnlyList<Expression> parents)
Parameters
Type Name Description
Table table
IReadOnlyList<Expression> parents
Returns
Type Description
ColumnReference
Overrides
Mangrove.MetricSetSyntaxTree.Expression<Mangrove.MetricSetSyntaxTree.ExpressionNodes.ColumnReference, Mangrove.MetricSetSyntaxTree.Table>.Clone(Mangrove.MetricSetSyntaxTree.Table, System.Collections.Generic.IReadOnlyList<Mangrove.MetricSetSyntaxTree.Expression>)
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Clone(IReadOnlyDictionary<String, String>)

Declaration
public ColumnReference Clone(IReadOnlyDictionary<string, string> newMetadata)
Parameters
Type Name Description
IReadOnlyDictionary<String, String> newMetadata
Returns
Type Description
ColumnReference
View Source

Clone(String)

Declaration
public ColumnReference Clone(string newName)
Parameters
Type Name Description
String newName
Returns
Type Description
ColumnReference
View Source

ToString()

Declaration
public override string ToString()
Returns
Type Description
String
Overrides

Implements

Extension Methods