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[SPARK-34786][SQL][FOLLOWUP] Explicitly declare DecimalType(20, 0) for Parquet UINT_64 #32390

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Original file line number Diff line number Diff line change
Expand Up @@ -141,7 +141,9 @@ class ParquetToSparkSchemaConverter(
originalType match {
case INT_64 | null => LongType
case DECIMAL => makeDecimalType(Decimal.MAX_LONG_DIGITS)
case UINT_64 => DecimalType.LongDecimal
// The precision to hold the largest unsigned long is:
// `java.lang.Long.toUnsignedString(-1).length` = 20
case UINT_64 => DecimalType(20, 0)
case TIMESTAMP_MICROS => TimestampType
case TIMESTAMP_MILLIS => TimestampType
case _ => illegalType()
Expand Down