[ https://issues.apache.org/jira/browse/SPARK-39316?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
XiDuo You updated SPARK-39316: ------------------------------ Description: Fix the bug of `TypeCoercion`, for example: {code:java} SELECT CAST(1 AS DECIMAL(28, 2)) UNION ALL SELECT CAST(1 AS DECIMAL(18, 2)) / CAST(1 AS DECIMAL(18, 2)); {code} The union result data type is not correct according to the formula: || Operation || Result Precision || Result Scale || |e1 union e2 | max(s1, s2) + max(p1-s1, p2-s2) | max(s1, s2) | {code:java} -- before -- query schema decimal(28,2) -- query output 1.00 1.00 -- after -- query schema decimal(38,20) -- query output 1.00000000000000000000 1.00000000000000000000 {code} was: Merge {{PromotePrecision}} into {{{}dataType{}}}, for example, {{{}Add{}}}: {code:java} override def dataType: DataType = (left, right) match { case (DecimalType.Expression(p1, s1), DecimalType.Expression(p2, s2)) => val resultScale = max(s1, s2) if (allowPrecisionLoss) { DecimalType.adjustPrecisionScale(max(p1 - s1, p2 - s2) + resultScale + 1, resultScale) } else { DecimalType.bounded(max(p1 - s1, p2 - s2) + resultScale + 1, resultScale) } case _ => super.dataType } {code} Merge {{{}CheckOverflow{}}}, for example, {{Add}} eval: {code:java} dataType match { case decimalType: DecimalType => val value = numeric.plus(input1, input2) checkOverflow(value.asInstanceOf[Decimal], decimalType) ... } {code} > Merge PromotePrecision and CheckOverflow into decimal binary arithmetic > ----------------------------------------------------------------------- > > Key: SPARK-39316 > URL: https://issues.apache.org/jira/browse/SPARK-39316 > Project: Spark > Issue Type: Sub-task > Components: SQL > Affects Versions: 3.4.0 > Reporter: XiDuo You > Assignee: XiDuo You > Priority: Major > Fix For: 3.4.0 > > > Fix the bug of `TypeCoercion`, for example: > {code:java} > SELECT CAST(1 AS DECIMAL(28, 2)) > UNION ALL > SELECT CAST(1 AS DECIMAL(18, 2)) / CAST(1 AS DECIMAL(18, 2)); > {code} > The union result data type is not correct according to the formula: > || Operation || Result Precision || Result Scale || > |e1 union e2 | max(s1, s2) + max(p1-s1, p2-s2) | max(s1, s2) | > {code:java} > -- before > -- query schema > decimal(28,2) > -- query output > 1.00 > 1.00 > -- after > -- query schema > decimal(38,20) > -- query output > 1.00000000000000000000 > 1.00000000000000000000 > {code} -- This message was sent by Atlassian Jira (v8.20.10#820010) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org