Disable small decimal to-arrow conversion

Signed-off-by: Adam Gutglick <[email protected]>

Author: AdamGS

vortex-dtype/src/arrow.rs

@@ -214,12 +214,13 @@ impl DType {
                 let scale = dt.scale();
 
                 match precision {
-                    // DECIMAL32_MAX_PRECISION
-                    0..=9 => DataType::Decimal32(precision, scale),
-                    // DECIMAL64_MAX_PRECISION
-                    10..=18 => DataType::Decimal64(precision, scale),
+                    // This code is commented out until DataFusion improves its support for smaller decimals.
+                    // // DECIMAL32_MAX_PRECISION
+                    // 0..=9 => DataType::Decimal32(precision, scale),
+                    // // DECIMAL64_MAX_PRECISION
+                    // 10..=18 => DataType::Decimal64(precision, scale),
                     // DECIMAL128_MAX_PRECISION
-                    19..=38 => DataType::Decimal128(precision, scale),
+                    0..=38 => DataType::Decimal128(precision, scale),
                     // DECIMAL256_MAX_PRECISION
                     39.. => DataType::Decimal256(precision, scale),
                 }