internal override GremlinToSqlContext GetContext()
{
GremlinToSqlContext inputContext = GetInputContext();
RepeatTraversal.GetStartOp().InheritedVariableFromParent(inputContext);
GremlinToSqlContext repeatContext = RepeatTraversal.GetEndOp().GetContext();
RepeatCondition repeatCondition = new RepeatCondition();
repeatCondition.StartFromContext = StartFromContext;
repeatCondition.IsEmitContext = EmitContext;
if (IsEmit)
{
GremlinToSqlContext emitContext = new GremlinToSqlContext();
emitContext.AddPredicate(SqlUtil.GetTrueBooleanComparisonExpr());
repeatCondition.EmitContext = emitContext;
}
if (TerminationPredicate != null)
{
throw new NotImplementedException();
}
if (TerminationTraversal != null)
{
TerminationTraversal.GetStartOp().InheritedVariableFromParent(repeatContext);
repeatCondition.TerminationContext = TerminationTraversal.GetEndOp().GetContext();
}
if (EmitPredicate != null)
{
throw new NotImplementedException();
}
if (EmitTraversal != null)
{
EmitTraversal.GetStartOp().InheritedVariableFromParent(repeatContext);
repeatCondition.EmitContext = EmitTraversal.GetEndOp().GetContext();
}
if (RepeatTimes != -1)
{
repeatCondition.RepeatTimes = RepeatTimes;
}
inputContext.PivotVariable.Repeat(inputContext, repeatContext, repeatCondition);
return inputContext;
}
internal override GremlinToSqlContext GetContext()
{
if (this.IsFake)
{
throw new TranslationException("The fake repeat operator can not get context");
}
GremlinToSqlContext inputContext = GetInputContext();
if (inputContext.PivotVariable == null)
{
throw new TranslationException("The PivotVariable of repeat()-step can't be null.");
}
// Convert GremlinParentContextOp to GremlinRepeatParentContextOp
// Because It is different for "__" in Repeat-traversal and in other operator-traversal such as FlatMap.
var oldStartOp = RepeatTraversal.GetStartOp() as GremlinParentContextOp;
Debug.Assert(oldStartOp != null);
RepeatTraversal.ReplaceGremlinOperator(0, new GremlinRepeatParentContextOp(oldStartOp));
RepeatTraversal.GetStartOp().InheritedVariableFromParent(inputContext);
GremlinToSqlContext repeatContext = RepeatTraversal.GetEndOp().GetContext();
foreach (var variable in repeatContext.TableReferencesInFromClause)
{
if (variable is GremlinFoldVariable ||
variable is GremlinCountVariable ||
variable is GremlinMinVariable ||
variable is GremlinMaxVariable ||
variable is GremlinSumVariable ||
variable is GremlinMeanVariable ||
variable is GremlinTreeVariable)
{
throw new SyntaxErrorException($"The parent of a reducing barrier can not be repeat()-step: {variable.GetType()}");
}
var group = variable as GremlinGroupVariable;
if (group != null && group.SideEffectKey == null)
{
throw new SyntaxErrorException($"The parent of a reducing barrier can not be repeat()-step: {variable.GetType()}");
}
}
foreach (var variable in repeatContext.FetchAllTableVars())
{
if (variable is GremlinRepeatVariable)
{
throw new SyntaxErrorException("The repeat()-step can't include another nesting repeat()-step:");
}
}
RepeatCondition repeatCondition = new RepeatCondition();
repeatCondition.StartFromContext = StartFromContext;
repeatCondition.IsEmitContext = EmitContext;
if (IsEmit)
{
GremlinToSqlContext emitContext = new GremlinToSqlContext();
emitContext.AddPredicate(SqlUtil.GetTrueBooleanComparisonExpr());
repeatCondition.EmitContext = emitContext;
}
if (TerminationPredicate != null)
{
throw new NotImplementedException();
}
if (TerminationTraversal != null)
{
// Convert GremlinParentContextOp to GremlinUntilParentContextOp
// Because It is different for "__" in Until-traversal and in other operator-traversal such as FlatMap.
var old = TerminationTraversal.GetStartOp() as GremlinParentContextOp;
Debug.Assert(old != null);
TerminationTraversal.ReplaceGremlinOperator(0, new GremlinUntilParentContextOp(old));
this.TerminationTraversal.GetStartOp().InheritedVariableFromParent(inputContext);
repeatCondition.TerminationContext = this.TerminationTraversal.GetEndOp().GetContext();
}
if (EmitPredicate != null)
{
throw new NotImplementedException();
}
if (EmitTraversal != null)
{
// Convert GremlinParentContextOp to GremlinEmitParentContextOp
// Because It is different for "__" in Emit-traversal and in other operator-traversal such as FlatMap.
var old = EmitTraversal.GetStartOp() as GremlinParentContextOp;
Debug.Assert(old != null);
EmitTraversal.ReplaceGremlinOperator(0, new GremlinEmitParentContextOp(old));
this.EmitTraversal.GetStartOp().InheritedVariableFromParent(inputContext);
repeatCondition.EmitContext = this.EmitTraversal.GetEndOp().GetContext();
}
if (RepeatTimes != -1)
{
repeatCondition.RepeatTimes = RepeatTimes;
}
inputContext.PivotVariable.Repeat(inputContext, repeatContext, repeatCondition);
return(inputContext);
}
internal override GremlinToSqlContext GetContext()
{
GremlinToSqlContext inputContext = GetInputContext();
if (inputContext.PivotVariable == null)
{
throw new QueryCompilationException("The PivotVariable can't be null.");
}
RepeatTraversal.GetStartOp().InheritedVariableFromParent(inputContext);
GremlinToSqlContext repeatContext = RepeatTraversal.GetEndOp().GetContext();
foreach (var variable in repeatContext.TableReferences)
{
if (variable is GremlinFoldVariable ||
variable is GremlinCountVariable ||
variable is GremlinMinVariable ||
variable is GremlinMaxVariable ||
variable is GremlinSumVariable ||
variable is GremlinMeanVariable ||
variable is GremlinTreeVariable)
{
throw new SyntaxErrorException($"The parent of a reducing barrier can not be repeat()-step: {variable.GetType()}");
}
var group = variable as GremlinGroupVariable;
if (group != null && group.SideEffectKey == null)
{
throw new SyntaxErrorException($"The parent of a reducing barrier can not be repeat()-step: {variable.GetType()}");
}
}
foreach (var variable in repeatContext.FetchAllTableVars())
{
if (variable is GremlinRepeatVariable)
{
throw new SyntaxErrorException("The repeat()-step can't include another nesting repeat()-step:");
}
}
RepeatCondition repeatCondition = new RepeatCondition();
repeatCondition.StartFromContext = StartFromContext;
repeatCondition.IsEmitContext = EmitContext;
if (IsEmit)
{
GremlinToSqlContext emitContext = new GremlinToSqlContext();
emitContext.AddPredicate(SqlUtil.GetTrueBooleanComparisonExpr());
repeatCondition.EmitContext = emitContext;
}
if (TerminationPredicate != null)
{
throw new NotImplementedException();
}
if (TerminationTraversal != null)
{
if (StartFromContext)
{
TerminationTraversal.GetStartOp().InheritedVariableFromParent(inputContext);
}
else
{
TerminationTraversal.GetStartOp().InheritedVariableFromParent(repeatContext);
}
repeatCondition.TerminationContext = TerminationTraversal.GetEndOp().GetContext();
}
if (EmitPredicate != null)
{
throw new NotImplementedException();
}
if (EmitTraversal != null)
{
if (EmitContext)
{
EmitTraversal.GetStartOp().InheritedVariableFromParent(inputContext);
}
else
{
EmitTraversal.GetStartOp().InheritedVariableFromParent(repeatContext);
}
repeatCondition.EmitContext = EmitTraversal.GetEndOp().GetContext();
}
if (RepeatTimes != -1)
{
repeatCondition.RepeatTimes = RepeatTimes;
}
inputContext.PivotVariable.Repeat(inputContext, repeatContext, repeatCondition);
return(inputContext);
}