private static Task <TryCatch <CosmosQueryExecutionContext> > TryCreatePassthroughQueryExecutionContextAsync(
CosmosQueryContext cosmosQueryContext,
InputParameters inputParameters,
PartitionedQueryExecutionInfo partitionedQueryExecutionInfo,
List <Documents.PartitionKeyRange> targetRanges,
string collectionRid,
CancellationToken cancellationToken)
{
CosmosCrossPartitionQueryExecutionContext.CrossPartitionInitParams initParams = new CosmosCrossPartitionQueryExecutionContext.CrossPartitionInitParams(
sqlQuerySpec: inputParameters.SqlQuerySpec,
collectionRid: collectionRid,
partitionedQueryExecutionInfo: partitionedQueryExecutionInfo,
partitionKeyRanges: targetRanges,
initialPageSize: inputParameters.MaxItemCount,
maxConcurrency: inputParameters.MaxConcurrency,
maxItemCount: inputParameters.MaxItemCount,
maxBufferedItemCount: inputParameters.MaxBufferedItemCount,
returnResultsInDeterministicOrder: inputParameters.ReturnResultsInDeterministicOrder,
testSettings: inputParameters.TestInjections);
return(PipelinedDocumentQueryExecutionContext.TryCreatePassthroughAsync(
inputParameters.ExecutionEnvironment,
cosmosQueryContext,
initParams,
inputParameters.InitialUserContinuationToken,
cancellationToken));
}
private static async Task <TryCatch <CosmosQueryExecutionContext> > TryCreateSpecializedDocumentQueryExecutionContextAsync(
CosmosQueryContext cosmosQueryContext,
InputParameters inputParameters,
PartitionedQueryExecutionInfo partitionedQueryExecutionInfo,
List <Documents.PartitionKeyRange> targetRanges,
string collectionRid,
CancellationToken cancellationToken)
{
QueryInfo queryInfo = partitionedQueryExecutionInfo.QueryInfo;
bool getLazyFeedResponse = queryInfo.HasTop;
// We need to compute the optimal initial page size for order-by queries
long optimalPageSize = inputParameters.MaxItemCount;
if (queryInfo.HasOrderBy)
{
int top;
if (queryInfo.HasTop && (top = partitionedQueryExecutionInfo.QueryInfo.Top.Value) > 0)
{
// All partitions should initially fetch about 1/nth of the top value.
long pageSizeWithTop = (long)Math.Min(
Math.Ceiling(top / (double)targetRanges.Count) * CosmosQueryExecutionContextFactory.PageSizeFactorForTop,
top);
optimalPageSize = Math.Min(pageSizeWithTop, optimalPageSize);
}
else if (cosmosQueryContext.IsContinuationExpected)
{
optimalPageSize = (long)Math.Min(
Math.Ceiling(optimalPageSize / (double)targetRanges.Count) * CosmosQueryExecutionContextFactory.PageSizeFactorForTop,
optimalPageSize);
}
}
Debug.Assert(
(optimalPageSize > 0) && (optimalPageSize <= int.MaxValue),
$"Invalid MaxItemCount {optimalPageSize}");
CosmosCrossPartitionQueryExecutionContext.CrossPartitionInitParams initParams = new CosmosCrossPartitionQueryExecutionContext.CrossPartitionInitParams(
sqlQuerySpec: inputParameters.SqlQuerySpec,
collectionRid: collectionRid,
partitionedQueryExecutionInfo: partitionedQueryExecutionInfo,
partitionKeyRanges: targetRanges,
initialPageSize: (int)optimalPageSize,
maxConcurrency: inputParameters.MaxConcurrency,
maxItemCount: inputParameters.MaxItemCount,
maxBufferedItemCount: inputParameters.MaxBufferedItemCount,
returnResultsInDeterministicOrder: inputParameters.ReturnResultsInDeterministicOrder,
testSettings: inputParameters.TestInjections);
return(await PipelinedDocumentQueryExecutionContext.TryCreateAsync(
inputParameters.ExecutionEnvironment,
cosmosQueryContext,
initParams,
inputParameters.InitialUserContinuationToken,
cancellationToken));
}