Use bigdecimal env

.cargo/config.toml

@@ -0,0 +1,3 @@
+[env]
+RUST_BIGDECIMAL_FMT_EXPONENTIAL_LOWER_THRESHOLD="100"
+RUST_BIGDECIMAL_FMT_EXPONENTIAL_UPPER_THRESHOLD="100"

datafusion/sqllogictest/src/engines/conversion.rs

@@ -104,30 +104,7 @@ pub(crate) fn big_decimal_to_str(value: BigDecimal) -> String {
     // Round the value to limit the number of decimal places
     let value = value.round(12).normalized();
     // Format the value to a string
-    format_big_decimal(value)
-}
-
-fn format_big_decimal(value: BigDecimal) -> String {
-    let (integer, scale) = value.into_bigint_and_exponent();
-    let mut str = integer.to_str_radix(10);
-    if scale <= 0 {
-        // Append zeros to the right of the integer part
-        str.extend(std::iter::repeat('0').take(scale.unsigned_abs() as usize));
-        str
-    } else {
-        let (sign, unsigned_len, unsigned_str) = if integer.is_negative() {
-            ("-", str.len() - 1, &str[1..])
-        } else {
-            ("", str.len(), &str[..])
-        };
-        let scale = scale as usize;
-        if unsigned_len <= scale {
-            format!("{}0.{:0>scale$}", sign, unsigned_str)
-        } else {
-            str.insert(str.len() - scale, '.');
-            str
-        }
-    }
+    value.to_string()
 }
 
 #[cfg(test)]

datafusion/sqllogictest/test_files/aggregate.slt

@@ -437,7 +437,7 @@ SELECT var_pop(c2) FROM aggregate_test_100
 query R
 SELECT var_pop(c6) FROM aggregate_test_100
 ----
-26156334342021890000000000000000000000
+2615633434202189e+22
 
 # csv_query_variance_3
 query R