keep existing test for parse_string_to_decimal_native and add equivalency test with parse_decimal.

Author: himadripal

arrow-cast/src/cast/decimal.rs

@@ -590,24 +590,51 @@ where
 #[cfg(test)]
 mod tests {
     use super::*;
+    use crate::parse::parse_decimal;
 
     #[test]
     fn test_parse_string_to_decimal_native() -> Result<(), ArrowError> {
         assert_eq!(
             parse_string_to_decimal_native::<Decimal128Type>("0", 0)?,
             0_i128
         );
+        assert_eq!(
+            parse_decimal::<Decimal128Type>("0", 38, 0)?,
+            parse_string_to_decimal_native::<Decimal128Type>("0", 0)?,
+            "value is {}",
+            0_i128
+        );
+
         assert_eq!(
             parse_string_to_decimal_native::<Decimal128Type>("0", 5)?,
             0_i128
         );
+        assert_eq!(
+            parse_decimal::<Decimal128Type>("0", 38, 5)?,
+            parse_string_to_decimal_native::<Decimal128Type>("0", 5)?,
+            "value is {}",
+            0_i128
+        );
 
         assert_eq!(
             parse_string_to_decimal_native::<Decimal128Type>("123", 0)?,
             123_i128
         );
         assert_eq!(
+            parse_decimal::<Decimal128Type>("123", 38, 0)?,
+            parse_string_to_decimal_native::<Decimal128Type>("123", 0)?,
+            "value is {}",
+            123_i128
+        );
+
+        assert_eq!(
+            parse_string_to_decimal_native::<Decimal128Type>("123", 5)?,
+            12300000_i128
+        );
+        assert_eq!(
+            parse_decimal::<Decimal128Type>("123", 38, 5)?,
             parse_string_to_decimal_native::<Decimal128Type>("123", 5)?,
+            "value is {}",
             12300000_i128
         );
 
@@ -616,16 +643,42 @@ mod tests {
             123_i128
         );
         assert_eq!(
+            parse_decimal::<Decimal128Type>("123.45", 38, 0)?,
+            parse_string_to_decimal_native::<Decimal128Type>("123.45", 0)?,
+            "value is {}",
+            123_i128
+        );
+
+        assert_eq!(
+            parse_string_to_decimal_native::<Decimal128Type>("123.45", 5)?,
+            12345000_i128
+        );
+        assert_eq!(
+            parse_decimal::<Decimal128Type>("123.45", 38, 5)?,
             parse_string_to_decimal_native::<Decimal128Type>("123.45", 5)?,
+            "value is {}",
             12345000_i128
         );
 
         assert_eq!(
-            parse_string_to_decimal_native::<Decimal128Type>("123.4567891", 0)?,
-            123_i128
+            parse_string_to_decimal_native::<Decimal128Type>("123.4567891", 5)?,
+            12345679_i128
+        );
+        assert_eq!(
+            parse_decimal::<Decimal128Type>("123.4567891", 38, 5)?,
+            parse_string_to_decimal_native::<Decimal128Type>("123.4567891", 5)?,
+            "value is {}",
+            12345679_i128
+        );
+
+        assert_eq!(
+            parse_string_to_decimal_native::<Decimal128Type>("123.4567891", 5)?,
+            12345679_i128
         );
         assert_eq!(
+            parse_decimal::<Decimal128Type>("123.4567891", 38, 5)?,
             parse_string_to_decimal_native::<Decimal128Type>("123.4567891", 5)?,
+            "value is {}",
             12345679_i128
         );
         Ok(())