liukun4515 commented on code in PR #2360:
URL: https://github.com/apache/arrow-rs/pull/2360#discussion_r941927655
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arrow/src/datatypes/datatype.rs:
##########
@@ -263,6 +265,706 @@ impl fmt::Display for DataType {
}
}
+// Max decimal128 value of little-endian format for each precision.
+pub(crate) const MAX_DECIMAL_BYTES_FOR_EACH_PRECISION: [[u8; 16]; 38] = [
+ 9_i128.to_le_bytes(),
+ 99_i128.to_le_bytes(),
+ 999_i128.to_le_bytes(),
+ 9999_i128.to_le_bytes(),
+ 99999_i128.to_le_bytes(),
+ 999999_i128.to_le_bytes(),
+ 9999999_i128.to_le_bytes(),
+ 99999999_i128.to_le_bytes(),
+ 999999999_i128.to_le_bytes(),
+ 9999999999_i128.to_le_bytes(),
+ 99999999999_i128.to_le_bytes(),
+ 999999999999_i128.to_le_bytes(),
+ 9999999999999_i128.to_le_bytes(),
+ 99999999999999_i128.to_le_bytes(),
+ 999999999999999_i128.to_le_bytes(),
+ 9999999999999999_i128.to_le_bytes(),
+ 99999999999999999_i128.to_le_bytes(),
+ 999999999999999999_i128.to_le_bytes(),
+ 9999999999999999999_i128.to_le_bytes(),
+ 99999999999999999999_i128.to_le_bytes(),
+ 999999999999999999999_i128.to_le_bytes(),
+ 9999999999999999999999_i128.to_le_bytes(),
+ 99999999999999999999999_i128.to_le_bytes(),
+ 999999999999999999999999_i128.to_le_bytes(),
+ 9999999999999999999999999_i128.to_le_bytes(),
+ 99999999999999999999999999_i128.to_le_bytes(),
+ 999999999999999999999999999_i128.to_le_bytes(),
+ 9999999999999999999999999999_i128.to_le_bytes(),
+ 99999999999999999999999999999_i128.to_le_bytes(),
+ 999999999999999999999999999999_i128.to_le_bytes(),
+ 9999999999999999999999999999999_i128.to_le_bytes(),
+ 99999999999999999999999999999999_i128.to_le_bytes(),
+ 999999999999999999999999999999999_i128.to_le_bytes(),
+ 9999999999999999999999999999999999_i128.to_le_bytes(),
+ 99999999999999999999999999999999999_i128.to_le_bytes(),
+ 999999999999999999999999999999999999_i128.to_le_bytes(),
+ 9999999999999999999999999999999999999_i128.to_le_bytes(),
+ 99999999999999999999999999999999999999_i128.to_le_bytes(),
+];
+
+// Min decimal128 value of little-endian format for each precision.
+pub(crate) const MIN_DECIMAL_BYTES_FOR_EACH_PRECISION: [[u8; 16]; 38] = [
+ (-9_i128).to_le_bytes(),
+ (-99_i128).to_le_bytes(),
+ (-999_i128).to_le_bytes(),
+ (-9999_i128).to_le_bytes(),
+ (-99999_i128).to_le_bytes(),
+ (-999999_i128).to_le_bytes(),
+ (-9999999_i128).to_le_bytes(),
+ (-99999999_i128).to_le_bytes(),
+ (-999999999_i128).to_le_bytes(),
+ (-9999999999_i128).to_le_bytes(),
+ (-99999999999_i128).to_le_bytes(),
+ (-999999999999_i128).to_le_bytes(),
+ (-9999999999999_i128).to_le_bytes(),
+ (-99999999999999_i128).to_le_bytes(),
+ (-999999999999999_i128).to_le_bytes(),
+ (-9999999999999999_i128).to_le_bytes(),
+ (-99999999999999999_i128).to_le_bytes(),
+ (-999999999999999999_i128).to_le_bytes(),
+ (-9999999999999999999_i128).to_le_bytes(),
+ (-99999999999999999999_i128).to_le_bytes(),
+ (-999999999999999999999_i128).to_le_bytes(),
+ (-9999999999999999999999_i128).to_le_bytes(),
+ (-99999999999999999999999_i128).to_le_bytes(),
+ (-999999999999999999999999_i128).to_le_bytes(),
+ (-9999999999999999999999999_i128).to_le_bytes(),
+ (-99999999999999999999999999_i128).to_le_bytes(),
+ (-999999999999999999999999999_i128).to_le_bytes(),
+ (-9999999999999999999999999999_i128).to_le_bytes(),
+ (-99999999999999999999999999999_i128).to_le_bytes(),
+ (-999999999999999999999999999999_i128).to_le_bytes(),
+ (-9999999999999999999999999999999_i128).to_le_bytes(),
+ (-99999999999999999999999999999999_i128).to_le_bytes(),
+ (-999999999999999999999999999999999_i128).to_le_bytes(),
+ (-9999999999999999999999999999999999_i128).to_le_bytes(),
+ (-99999999999999999999999999999999999_i128).to_le_bytes(),
+ (-999999999999999999999999999999999999_i128).to_le_bytes(),
+ (-9999999999999999999999999999999999999_i128).to_le_bytes(),
+ (-99999999999999999999999999999999999999_i128).to_le_bytes(),
+];
+
+// MAX decimal256 value of little-endian format for each precision.
+pub(crate) const MAX_DECIMAL_BYTES_FOR_LARGER_EACH_PRECISION: [[u8; 32]; 76] =
[
Review Comment:
From your suggestion, I will add test to check the const table with the raw
format.
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