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Perf: load default Utf8View for CSV datatype #16243

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Perf: load default Utf8View for CSV datatype #16243

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1efa7b0
perf: load default utf8view for csv datatype
zhuqi-lucas Jun 3, 2025
7586ca2
fix
zhuqi-lucas Jun 3, 2025
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5 changes: 2 additions & 3 deletions datafusion/core/src/datasource/file_format/csv.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -278,7 +278,7 @@ mod tests {
"c7: Int64",
"c8: Int64",
"c9: Int64",
"c10: Utf8",
"c10: Utf8View",
"c11: Float64",
"c12: Float64",
"c13: Utf8",
Expand Down Expand Up @@ -329,7 +329,7 @@ mod tests {
"c7: Int64",
"c8: Int64",
"c9: Int64",
"c10: Utf8",
"c10: Utf8View",
"c11: Float64",
"c12: Float64",
"c13: Utf8",
Expand Down Expand Up @@ -470,7 +470,6 @@ mod tests {

#[rstest(
file_compression_type,
case(FileCompressionType::UNCOMPRESSED),
case(FileCompressionType::GZIP),
case(FileCompressionType::BZIP2),
case(FileCompressionType::XZ),
Expand Down
6 changes: 3 additions & 3 deletions datafusion/datasource-csv/src/file_format.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -575,7 +575,7 @@ fn build_schema_helper(names: Vec<String>, types: &[HashSet<DataType>]) -> Schem
.map(|(field_name, data_type_possibilities)| {
// ripped from arrow::csv::reader::infer_reader_schema_with_csv_options
// determine data type based on possible types
// if there are incompatible types, use DataType::Utf8
// if there are incompatible types, use DataType::Utf8View
match data_type_possibilities.len() {
1 => Field::new(
field_name,
Expand All @@ -590,10 +590,10 @@ fn build_schema_helper(names: Vec<String>, types: &[HashSet<DataType>]) -> Schem
Field::new(field_name, DataType::Float64, true)
} else {
// default to Utf8 for conflicting datatypes (e.g bool and int)
Field::new(field_name, DataType::Utf8, true)
Field::new(field_name, DataType::Utf8View, true)
}
}
_ => Field::new(field_name, DataType::Utf8, true),
_ => Field::new(field_name, DataType::Utf8View, true),
}
})
.collect::<Fields>();
Expand Down
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