fix: Fix printing max scale decimals (pola-rs#16048)

Wouittone · Jun 22, 2024 · 267e27c · 267e27c
1 parent 2dfa217
commit 267e27c
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diff --git a/crates/polars-arrow/src/compute/decimal.rs b/crates/polars-arrow/src/compute/decimal.rs
@@ -134,7 +134,7 @@ impl FormatBuffer {
     }
 }
 
-const POW10: [i128; 38] = [
+const POW10: [i128; 39] = [
     1,
     10,
     100,
@@ -173,6 +173,7 @@ const POW10: [i128; 38] = [
     100000000000000000000000000000000000,
     1000000000000000000000000000000000000,
     10000000000000000000000000000000000000,
+    100000000000000000000000000000000000000,
 ];
 
 pub fn format_decimal(v: i128, scale: usize, trim_zeros: bool) -> FormatBuffer {

diff --git a/py-polars/tests/unit/test_format.py b/py-polars/tests/unit/test_format.py
@@ -404,3 +404,16 @@ def test_format_numeric_locale_options() -> None:
 │ yy  ┆ -234567.89    ┆ 44444444444 ┆ -9999999.9900 │
 └─────┴───────────────┴─────────────┴───────────────┘"""
     )
+
+
+def test_fmt_decimal_max_scale() -> None:
+    values = [D("0.14282911023321884847623576259639164703")]
+    dtype = pl.Decimal(precision=38, scale=38)
+    s = pl.Series(values, dtype=dtype)
+    result = str(s)
+    expected = """shape: (1,)
+Series: '' [decimal[38,38]]
+[
+	0.14282911023321884847623576259639164703
+]"""
+    assert result == expected