Class KustoExpression

Expression emitter for the Kusto query language ( https://aka.ms/kdocs ). Can be used in Kusto emitters, or just for debugging.

Inheritance
Object
LoggingExpressionVisitorBase
ExpressionEmitterBase
KustoExpression
Inherited Members
Namespace: Mangrove.MetricSetEmitters
Assembly: MetricSetEmitters.dll
Syntax
public class KustoExpression : ExpressionEmitterBase, IGenericExpressionVisitor<string>, IExpressionVisitor, IGenericVisitor<string>

Constructors

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KustoExpression(ILogger)

Declaration
public KustoExpression(ILogger logger = null)
Parameters
Type Name Description
ILogger logger

Properties

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AssignmentOperator

Declaration
protected override string AssignmentOperator { get; }
Property Value
Type Description
String
Overrides
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BinaryAggregationToOperator

Declaration
protected override IReadOnlyDictionary<BinaryAggregationKind, (string prefix, string separator, string suffix)> BinaryAggregationToOperator { get; }
Property Value
Type Description
IReadOnlyDictionary<BinaryAggregationKind, ValueTuple<String, String, String>>
Overrides
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BinaryOperationToOperator

Declaration
protected override IReadOnlyDictionary<BinaryOperationKind, (string prefix, string infix, string suffix)> BinaryOperationToOperator { get; }
Property Value
Type Description
IReadOnlyDictionary<BinaryOperationKind, ValueTuple<String, String, String>>
Overrides
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LiteralFalse

Declaration
protected override string LiteralFalse { get; }
Property Value
Type Description
String
Overrides
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LiteralTrue

Declaration
protected override string LiteralTrue { get; }
Property Value
Type Description
String
Overrides
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Min_Max_Value

Not any sql key word can used by the MinValue and MaxValue, so use the constant.

Declaration
protected override Dictionary<string, string> Min_Max_Value { get; }
Property Value
Type Description
Dictionary<String, String>
Overrides
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NegativeInfinity

Declaration
protected override string NegativeInfinity { get; }
Property Value
Type Description
String
Overrides
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PositiveInfinity

Declaration
protected override string PositiveInfinity { get; }
Property Value
Type Description
String
Overrides
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TernaryOperationToOperator

Declaration
protected override IReadOnlyDictionary<TernaryOperationKind, (string prefix, string leftInfix, string rightInfix, string suffix)> TernaryOperationToOperator { get; }
Property Value
Type Description
IReadOnlyDictionary<TernaryOperationKind, ValueTuple<String, String, String, String>>
Overrides
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TypeKindToParseFromStringOperator

// See: https://kusto.azurewebsites.net/docs/kusto/query/tointfunction.html Char, Byte and UnsignedLong are not supported yet in Kusto

Declaration
protected override IReadOnlyDictionary<TypeKind, (string prefix, string suffix)> TypeKindToParseFromStringOperator { get; }
Property Value
Type Description
IReadOnlyDictionary<TypeKind, ValueTuple<String, String>>
Overrides
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TypeToName

Declaration
protected override IReadOnlyDictionary<TypeKind, string> TypeToName { get; }
Property Value
Type Description
IReadOnlyDictionary<TypeKind, String>
Overrides
Remarks

In Kusto all types are nullable, so the corresponding string for non-nullable types is the same as for nullable.

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TypeToNull

Declaration
protected override IReadOnlyDictionary<TypeKind, string> TypeToNull { get; }
Property Value
Type Description
IReadOnlyDictionary<TypeKind, String>
Overrides
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UnaryAggregationToOperator

Declaration
protected override IReadOnlyDictionary<UnaryAggregationKind, (string op, string prefix, string suffix)> UnaryAggregationToOperator { get; }
Property Value
Type Description
IReadOnlyDictionary<UnaryAggregationKind, ValueTuple<String, String, String>>
Overrides
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UnaryOperationToOperator

Declaration
protected override IReadOnlyDictionary<UnaryOperationKind, (string prefix, string suffix)> UnaryOperationToOperator { get; }
Property Value
Type Description
IReadOnlyDictionary<UnaryOperationKind, ValueTuple<String, String>>
Overrides
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VectorOperationToOperator

Declaration
protected override IReadOnlyDictionary<VectorOperationKind, (string prefix, string separator, string suffix)> VectorOperationToOperator { get; }
Property Value
Type Description
IReadOnlyDictionary<VectorOperationKind, ValueTuple<String, String, String>>
Overrides
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WindowFunctionSyntax

Declaration
protected override (string prefix, string separator, string suffix) WindowFunctionSyntax { get; }
Property Value
Type Description
ValueTuple<String, String, String>
Overrides

Methods

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Escape(String)

Declaration
protected override string Escape(string input)
Parameters
Type Name Description
String input
Returns
Type Description
String
Overrides
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Visit(Literal)

Kusto does not find common types for the ternary ("iff") operator, so we have to be explicit about literal types. Refer to subpages of this page for which kinds of literals may be wrapped like type(literal): https://docs.microsoft.com/en-us/azure/kusto/query/scalar-data-types/

Declaration
public override void Visit(Literal expr)
Parameters
Type Name Description
Literal expr
Overrides
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VisitCreateHistogramExpression(UnaryOperation)

Declaration
protected override void VisitCreateHistogramExpression(UnaryOperation expr)
Parameters
Type Name Description
UnaryOperation expr
Overrides
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VisitTypeCastExpression(UnaryOperation)

Visit a TypeCast expression.

Declaration
protected override void VisitTypeCastExpression(UnaryOperation expr)
Parameters
Type Name Description
UnaryOperation expr
Overrides
Remarks

The result is a string in the format totype(expression-string). For example, todouble( 3*2 ).

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VisitWithTracing(BinaryOperation)

Declaration
public override void VisitWithTracing(BinaryOperation expr)
Parameters
Type Name Description
BinaryOperation expr
Overrides
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VisitWithTracing(ColumnReference)

Declaration
public override void VisitWithTracing(ColumnReference expr)
Parameters
Type Name Description
ColumnReference expr
Overrides
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VisitWithTracing(UnaryWindowFunction)

Declaration
public override void VisitWithTracing(UnaryWindowFunction expr)
Parameters
Type Name Description
UnaryWindowFunction expr
Overrides

Implements

Extension Methods