internal override GraphViewExecutionOperator Compile(QueryCompilationContext context, GraphViewConnection dbConnection)
{
WScalarSubquery srcSubQuery = this.Parameters[0] as WScalarSubquery;
WScalarSubquery sinkSubQuery = this.Parameters[1] as WScalarSubquery;
if (srcSubQuery == null || sinkSubQuery == null)
{
throw new SyntaxErrorException("The first two parameters of AddE can only be WScalarSubquery.");
}
WValueExpression otherVTagParameter = this.Parameters[2] as WValueExpression;
WValueExpression edgeLabel = this.Parameters[3] as WValueExpression;
Debug.Assert(otherVTagParameter != null, "otherVTagParameter != null");
//
// if otherVTag == 0, this newly added edge's otherV() is the src vertex.
// Otherwise, it's the sink vertex
//
int otherVTag = int.Parse(otherVTagParameter.Value);
List <WPropertyExpression> edgeProperties = new List <WPropertyExpression>();
List <string> projectedField = new List <string>();
for (int i = 4; i < this.Parameters.Count; i += 1)
{
WPropertyExpression addedProperty = this.Parameters[i] as WPropertyExpression;
if (addedProperty != null)
{
edgeProperties.Add(addedProperty);
}
WValueExpression projectedProperty = this.Parameters[i] as WValueExpression;
if (projectedProperty != null)
{
projectedField.Add(projectedProperty.Value);
}
}
JObject edgeJsonObject = this.ConstructEdgeJsonObject(edgeLabel, edgeProperties);
QueryCompilationContext srcSubContext = new QueryCompilationContext(context);
GraphViewExecutionOperator srcSubQueryOp = srcSubQuery.SubQueryExpr.Compile(srcSubContext, dbConnection);
QueryCompilationContext sinkSubContext = new QueryCompilationContext(context);
GraphViewExecutionOperator sinkSubQueryOp = sinkSubQuery.SubQueryExpr.Compile(sinkSubContext, dbConnection);
GraphViewExecutionOperator addEOp = new AddEOperator(context.CurrentExecutionOperator, dbConnection,
srcSubContext.OuterContextOp, srcSubQueryOp, sinkSubContext.OuterContextOp, sinkSubQueryOp,
otherVTag, edgeJsonObject, projectedField);
context.CurrentExecutionOperator = addEOp;
foreach (string propertyName in projectedField)
{
ColumnGraphType columnGraphType = GraphViewReservedProperties.IsEdgeReservedProperty(propertyName)
? GraphViewReservedProperties.ReservedEdgePropertiesColumnGraphTypes[propertyName]
: ColumnGraphType.Value;
context.AddField(this.Alias.Value, propertyName, columnGraphType);
}
return(addEOp);
}
internal override GraphViewExecutionOperator Compile(QueryCompilationContext context, GraphViewConnection dbConnection)
{
List <string> projectedField;
var edgeJsonObject = ConstructEdgeJsonObject(out projectedField); // metadata remains missing
var srcSubQuery = Parameters[0] as WScalarSubquery;
var sinkSubQuery = Parameters[1] as WScalarSubquery;
if (srcSubQuery == null || sinkSubQuery == null)
{
throw new SyntaxErrorException("The first two parameters of AddE can only be WScalarSubquery.");
}
var otherVTagParameter = Parameters[2] as WValueExpression;
var otherVTag = int.Parse(otherVTagParameter.Value);
var srcSubQueryFunction = srcSubQuery.CompileToFunction(context, dbConnection);
var sinkSubQueryFunction = sinkSubQuery.CompileToFunction(context, dbConnection);
GraphViewExecutionOperator addEOp = new AddEOperator(context.CurrentExecutionOperator,
dbConnection, srcSubQueryFunction, sinkSubQueryFunction, otherVTag, edgeJsonObject, projectedField);
context.CurrentExecutionOperator = addEOp;
// Update context's record layout
context.AddField(Alias.Value, "_source", ColumnGraphType.EdgeSource);
context.AddField(Alias.Value, "_sink", ColumnGraphType.EdgeSink);
context.AddField(Alias.Value, "_other", ColumnGraphType.Value);
context.AddField(Alias.Value, "_offset", ColumnGraphType.EdgeOffset);
context.AddField(Alias.Value, "*", ColumnGraphType.EdgeObject);
for (var i = GraphViewReservedProperties.ReservedEdgeProperties.Count; i < projectedField.Count; i++)
{
context.AddField(Alias.Value, projectedField[i], ColumnGraphType.Value);
}
return(addEOp);
}
internal override GraphViewExecutionOperator Compile(QueryCompilationContext context, GraphViewCommand command)
{
WScalarSubquery srcSubQuery = Parameters[0] as WScalarSubquery;
WScalarSubquery sinkSubQuery = Parameters[1] as WScalarSubquery;
if (srcSubQuery == null || sinkSubQuery == null)
{
throw new SyntaxErrorException("The first two parameters of AddE can only be WScalarSubquery.");
}
Container container = new Container();
QueryCompilationContext srcSubContext = new QueryCompilationContext(context);
srcSubContext.OuterContextOp.SetContainer(container);
GraphViewExecutionOperator srcSubQueryOp = srcSubQuery.SubQueryExpr.Compile(srcSubContext, command);
QueryCompilationContext sinkSubContext = new QueryCompilationContext(context);
sinkSubContext.OuterContextOp.SetContainer(container);
GraphViewExecutionOperator sinkSubQueryOp = sinkSubQuery.SubQueryExpr.Compile(sinkSubContext, command);
WValueExpression otherVTagParameter = Parameters[2] as WValueExpression;
Debug.Assert(otherVTagParameter != null, "otherVTagParameter != null");
//
// if otherVTag == 0, this newly added edge's otherV() is the src vertex.
// Otherwise, it's the sink vertex
//
int otherVTag = int.Parse(otherVTagParameter.Value);
WValueExpression labelValue = (WValueExpression)this.Parameters[3];
List <WPropertyExpression> edgeProperties = new List <WPropertyExpression>();
List <PropertyTuple> subtraversalProperties = new List <PropertyTuple>();
List <string> projectedField = new List <string>(GraphViewReservedProperties.ReservedEdgeProperties);
projectedField.Add(GremlinKeyword.Label);
for (int i = 4; i < this.Parameters.Count; i++)
{
WPropertyExpression property = (WPropertyExpression)this.Parameters[i];
Debug.Assert(property != null, "[WAddETableReference.Compile] Edge property should not be null");
Debug.Assert(property.Cardinality == GremlinKeyword.PropertyCardinality.Single, "[WAddETableReference.Compile] Edge property should not be append-mode");
Debug.Assert(property.Value != null);
if (!projectedField.Contains(property.Key.Value))
{
projectedField.Add(property.Key.Value);
}
if (property.Value is WValueExpression)
{
edgeProperties.Add(property);
}
else
{
WScalarSubquery scalarSubquery = property.Value as WScalarSubquery;
ScalarSubqueryFunction valueFunction = (ScalarSubqueryFunction)scalarSubquery.CompileToFunction(context, command);
subtraversalProperties.Add(new PropertyTuple(property.Cardinality, property.Key.Value, valueFunction));
}
}
JObject edgeJsonObject = ConstructEdgeJsonObject(command, labelValue.Value, edgeProperties); // metadata remains missing
GraphViewExecutionOperator addEOp = new AddEOperator(context.CurrentExecutionOperator, command, container,
srcSubQueryOp, sinkSubQueryOp, otherVTag, edgeJsonObject, projectedField, subtraversalProperties);
context.CurrentExecutionOperator = addEOp;
// Update context's record layout
context.AddField(Alias.Value, GremlinKeyword.EdgeSourceV, ColumnGraphType.EdgeSource);
context.AddField(Alias.Value, GremlinKeyword.EdgeSinkV, ColumnGraphType.EdgeSink);
context.AddField(Alias.Value, GremlinKeyword.EdgeOtherV, ColumnGraphType.Value);
context.AddField(Alias.Value, GremlinKeyword.EdgeID, ColumnGraphType.EdgeId);
context.AddField(Alias.Value, GremlinKeyword.Star, ColumnGraphType.EdgeObject);
for (var i = GraphViewReservedProperties.ReservedEdgeProperties.Count; i < projectedField.Count; i++)
{
context.AddField(Alias.Value, projectedField[i], ColumnGraphType.Value);
}
return(addEOp);
}