Virtuoso Backend: Optimize ODBC getCharData
Only use 1 SQLFetchData command in most of the cases. Callgrind stats show that 67.5% of the time in this function is spent in the first SQLFetchData, and an additional 27% in the second SQLGetData. We can avoid some of this extra cost, by only calling the function once. Also, doing a simple fetch of 50000 quads - Before Patch - 5.75 seconds After Patch - 4.70 seconds REVIEW: 106467
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