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[NSE-400] Fix the bug for negative decimal data #686

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merged 3 commits into from
Jan 10, 2022
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[NSE-400] Fix the bug for negative decimal data #686

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a66e63d
Fix the bug for positive decimal data
haojinIntel Jan 10, 2022
02c1ba7
Fix format
haojinIntel Jan 10, 2022
0386e02
Fix the unit test for 'SPARK-22348: table cache should do partition b…
haojinIntel Jan 10, 2022
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10 changes: 10 additions & 0 deletions native-sql-engine/cpp/src/operators/row_to_columnar_converter.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -393,6 +393,11 @@ arrow::Status CreateArrayData(std::shared_ptr<arrow::Schema> schema, int64_t num
for (int k = length - 1; k >= 0; k--) {
bytesValue2[length - 1 - k] = bytesValue[k];
}
if (int8_t(bytesValue[0]) < 0) {
for (int k = length; k < 16; k++) {
bytesValue2[k] = 255;
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note: for negative decimal, all unused bits are set to 1

}
}
arrow::Decimal128 value =
arrow::Decimal128(arrow::BasicDecimal128(bytesValue2));
array_data[position] = value;
Expand Down Expand Up @@ -950,6 +955,11 @@ arrow::Status CreateArrayData(std::shared_ptr<arrow::Schema> schema, int64_t num
for (int k = elementLength - 1; k >= 0; k--) {
bytesValue2[elementLength - 1 - k] = bytesValue[k];
}
if (int8_t(bytesValue[0]) < 0) {
for (int k = elementLength; k < 16; k++) {
bytesValue2[k] = 255;
}
}
arrow::Decimal128 value =
arrow::Decimal128(arrow::BasicDecimal128(bytesValue2));
RETURN_NOT_OK(child_builder.Append(value));
Expand Down