Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/8971#discussion_r41458139
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/columnar/ColumnStats.scala ---
@@ -245,7 +247,8 @@ private[sql] class FixedDecimalColumnStats(precision:
Int, scale: Int) extends C
val value = row.getDecimal(ordinal, precision, scale)
if (upper == null || value.compareTo(upper) > 0) upper = value
if (lower == null || value.compareTo(lower) < 0) lower = value
- sizeInBytes += FIXED_DECIMAL.defaultSize
+ // TODO: this is not right for DecimalType with precision > 18
+ sizeInBytes += 8
--- End diff --
Good point, thanks. I thinking it's better to get the number of written
bytes from buffer, no more guessing.
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