yaooqinn commented on issue #26905: [SPARK-30266][SQL] Avoid overflow and match error in ApproximatePercentile URL: https://github.com/apache/spark/pull/26905#issuecomment-566054534 ``` [info] - summary *** FAILED *** (18 milliseconds) [info] org.apache.spark.sql.AnalysisException: cannot resolve 'percentile_approx(`name`, [0.25,0.5,0.75], 10000)' due to data type mismatch: argument 1 requires (numeric or date or timestamp) type, however, '`name`' is of string type.;; [info] 'Aggregate [cast(count(name#1452) as string) AS name#1911, cast(count(age#1453) as string) AS age#1913, cast(count(height#1454) as string) AS height#1915, cast(avg(cast(name#1452 as double)) as string) AS name#1917, cast(avg(cast(age#1453 as bigint)) as string) AS age#1919, cast(avg(cast(height#1454 as bigint)) as string) AS height#1921, cast(stddev_samp(cast(name#1452 as double)) as string) AS name#1931, cast(stddev_samp(cast(age#1453 as double)) as string) AS age#1941, cast(stddev_samp(cast(height#1454 as double)) as string) AS height#1951, cast(min(name#1452) as string) AS name#1953, cast(min(age#1453) as string) AS age#1955, cast(min(height#1454) as string) AS height#1957, cast(percentile_approx(name#1452, [0.25,0.5,0.75], 10000, 0, 0)[0] as string) AS name#1959, cast(percentile_approx(age#1453, [0.25,0.5,0.75], 10000, 0, 0)[0] as string) AS age#1961, cast(percentile_approx(height#1454, [0.25,0.5,0.75], 10000, 0, 0)[0] as string) AS height#1963, cast(percentile_approx(name#1452, [0.25,0.5,0.75], 10000, 0, 0)[1] as string) AS name#1965, cast(percentile_approx(age#1453, [0.25,0.5,0.75], 10000, 0, 0)[1] as string) AS age#1967, cast(percentile_approx(height#1454, [0.25,0.5,0.75], 10000, 0, 0)[1] as string) AS height#1969, cast(percentile_approx(name#1452, [0.25,0.5,0.75], 10000, 0, 0)[2] as string) AS name#1971, cast(percentile_approx(age#1453, [0.25,0.5,0.75], 10000, 0, 0)[2] as string) AS age#1973, cast(percentile_approx(height#1454, [0.25,0.5,0.75], 10000, 0, 0)[2] as string) AS height#1975, cast(max(name#1452) as string) AS name#1977, cast(max(age#1453) as string) AS age#1979, cast(max(height#1454) as string) AS height#1981] ``` This ut fails indicates the miss usage of approximate percentile function for string values, the string will be cast to double before
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