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feat: Add LATERAL table function support (#18121) #18224

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feat: Add LATERAL table function support (#18121) #18224

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121 changes: 121 additions & 0 deletions datafusion/common/src/scalar/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1193,6 +1193,127 @@ impl ScalarValue {
})
}

/// Creates a non-null placeholder value of the given type.
///
/// Supports all Arrow data types. The `val` parameter allows generating
/// distinct placeholder values
pub fn try_new_placeholder(data_type: &DataType, val: i64) -> Result<Self> {
let placeholder = match data_type {
DataType::Int8 => ScalarValue::Int8(Some(val as i8)),
DataType::Int16 => ScalarValue::Int16(Some(val as i16)),
DataType::Int32 => ScalarValue::Int32(Some(val as i32)),
DataType::Int64 => ScalarValue::Int64(Some(val)),
DataType::UInt8 => ScalarValue::UInt8(Some(val as u8)),
DataType::UInt16 => ScalarValue::UInt16(Some(val as u16)),
DataType::UInt32 => ScalarValue::UInt32(Some(val as u32)),
DataType::UInt64 => ScalarValue::UInt64(Some(val as u64)),
DataType::Float32 => ScalarValue::Float32(Some(val as f32)),
DataType::Float64 => ScalarValue::Float64(Some(val as f64)),
DataType::Float16 => ScalarValue::Float16(Some(f16::from_f32(val as f32))),
DataType::Decimal128(precision, scale) => {
ScalarValue::Decimal128(Some(val as i128), *precision, *scale)
}
DataType::Decimal256(precision, scale) => ScalarValue::Decimal256(
Some(i256::from_i128(val as i128)),
*precision,
*scale,
),
DataType::Decimal32(precision, scale) => {
ScalarValue::Decimal32(Some(val as i32), *precision, *scale)
}
DataType::Decimal64(precision, scale) => {
ScalarValue::Decimal64(Some(val), *precision, *scale)
}
DataType::Utf8 => ScalarValue::Utf8(Some(val.to_string())),
DataType::LargeUtf8 => ScalarValue::LargeUtf8(Some(val.to_string())),
DataType::Utf8View => ScalarValue::Utf8View(Some(val.to_string())),
DataType::Binary => ScalarValue::Binary(Some(val.to_string().into_bytes())),
DataType::LargeBinary => {
ScalarValue::LargeBinary(Some(val.to_string().into_bytes()))
}
DataType::BinaryView => {
ScalarValue::BinaryView(Some(val.to_string().into_bytes()))
}
DataType::FixedSizeBinary(size) => {
let mut bytes = val.to_string().into_bytes();
bytes.resize(*size as usize, 0);
ScalarValue::FixedSizeBinary(*size, Some(bytes))
}
DataType::Boolean => ScalarValue::Boolean(Some(val % 2 == 1)),
DataType::Date32 => ScalarValue::Date32(Some(val as i32)),
DataType::Date64 => ScalarValue::Date64(Some(val)),
DataType::Time32(_) => ScalarValue::Time32Second(Some(val as i32)),
DataType::Time64(_) => ScalarValue::Time64Nanosecond(Some(val)),
DataType::Timestamp(unit, tz) => match unit {
TimeUnit::Second => ScalarValue::TimestampSecond(Some(val), tz.clone()),
TimeUnit::Millisecond => {
ScalarValue::TimestampMillisecond(Some(val), tz.clone())
}
TimeUnit::Microsecond => {
ScalarValue::TimestampMicrosecond(Some(val), tz.clone())
}
TimeUnit::Nanosecond => {
ScalarValue::TimestampNanosecond(Some(val), tz.clone())
}
},
DataType::Interval(_) => ScalarValue::IntervalYearMonth(Some(val as i32)),
DataType::Duration(_) => ScalarValue::DurationNanosecond(Some(val)),
DataType::Null => ScalarValue::Null,
DataType::List(field) => {
ScalarValue::List(ScalarValue::new_list_nullable(&[], field.data_type()))
}
DataType::LargeList(field) => ScalarValue::LargeList(
ScalarValue::new_large_list(&[], field.data_type()),
),
DataType::FixedSizeList(field, size) => {
let empty_arr = new_empty_array(field.data_type());
let values = Arc::new(
SingleRowListArrayBuilder::new(empty_arr)
.with_nullable(field.is_nullable())
.build_fixed_size_list_array(*size as usize),
);
ScalarValue::FixedSizeList(values)
}
DataType::ListView(field) => {
// ListView is not supported as a ScalarValue variant yet - use List as workaround
ScalarValue::List(ScalarValue::new_list_nullable(&[], field.data_type()))
}
DataType::LargeListView(field) => {
// LargeListView is not supported as a ScalarValue variant yet - use LargeList as workaround
ScalarValue::LargeList(ScalarValue::new_large_list(
&[],
field.data_type(),
))
}
DataType::Struct(fields) => ScalarValue::Struct(
new_null_array(&DataType::Struct(fields.clone()), 1)
.as_struct()
.to_owned()
.into(),
),
DataType::Union(fields, mode) => {
ScalarValue::Union(None, fields.clone(), *mode)
}
DataType::Map(field, sorted) => ScalarValue::Map(
new_null_array(&DataType::Map(Arc::clone(field), *sorted), 1)
.as_map()
.to_owned()
.into(),
),
DataType::Dictionary(key_type, value_type) => {
// Dictionaries: create placeholder of value type, encoding happens at execution time
let value = ScalarValue::try_new_placeholder(value_type, val)?;
ScalarValue::Dictionary(key_type.clone(), Box::new(value))
}
DataType::RunEndEncoded(_run_ends_type, _values_type) => {
return _internal_err!(
"Run-end encoded columns are not yet supported for placeholder creation"
);
}
};
Ok(placeholder)
}

/// Returns a [`ScalarValue::Utf8`] representing `val`
pub fn new_utf8(val: impl Into<String>) -> Self {
ScalarValue::from(val.into())
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