gengliangwang edited a comment on issue #25137: [SPARK-28348][SQL] Decimal precision promotion for binary arithmetic with casted decimal type URL: https://github.com/apache/spark/pull/25137#issuecomment-511815571 @maropu I just checked and found PostgreSQL and MySQL has bigger precision than Spark's(max precision as 38): > The maximum allowed precision when explicitly specified in the type declaration is 1000; https://www.postgresql.org/docs/10/datatype-numeric.html > M is the maximum number of digits (the precision). It has a range of 1 to 65. https://dev.mysql.com/doc/refman/5.7/en/precision-math-decimal-characteristics.html
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