private bool GetLineMultifileStreamable()
{
if (!_loadedFirstFiles)
{
GetLineMultifileStreamableLoadFirstFiles();
_loadedFirstFiles = true;
}
HqlDataSource prior = _from[_from.Count - 2]; // guaranteed to be present b/c there is more than one file
HqlDataSource src = _from[_from.Count - 1];
if (!_initializedForStreaming)
{
InitializeSourceForStreaming(src);
_initializedForStreaming = true;
}
if (src.ReadThroughUsingJoin(prior, prior.OnJoin, _where, true))
{
_line = _select.Evaluate(src.ResultValues);
return(true);
}
return(false);
}
private void GetLineMultifileStreamableLoadFirstFiles()
{
HqlDataSource prior = null;
for (int i = 0; i < _from.Count - 1; ++i)
{
HqlDataSource src = _from[i];
InitializeSourceForStreaming(src);
if (i == 0)
{
src.ReadThroughUsingJoin(null, src.OnJoin, _where, false);
}
else
{
src.ReadThroughUsingJoin(prior, prior.OnJoin, _where, false);
prior.DropLoadedData();
}
prior = src;
}
}
private void CalculateDataMultifiles()
{
HqlDataSource prior = _from[_from.Count - 2]; // guaranteed to be present b/c there is more than one file
HqlDataSource src = _from[_from.Count - 1];
InitializeSourceForStreaming(src);
for (; ; _linenum++)
{
if (src.ReadThroughUsingJoin(prior, prior.OnJoin, _where, true))
{
CreateKeyAndValue(src.ResultValues);
}
else
{
prior.DropLoadedData();
break;
}
}
}
