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], 1)' 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], 1, 0, 0)[0] as string)
AS name#1959, cast(percentile_approx(age#1453, [0.25,0.5,0.75], 1, 0, 0)[0]
as string) AS age#1961, cast(percentile_approx(height#1454, [0.25,0.5,0.75],
1, 0, 0)[0] as string) AS height#1963, cast(percentile_approx(name#1452,
[0.25,0.5,0.75], 1, 0, 0)[1] as string) AS name#1965,
cast(percentile_approx(age#1453, [0.25,0.5,0.75], 1, 0, 0)[1] as string) AS
age#1967, cast(percentile_approx(height#1454, [0.25,0.5,0.75], 1, 0, 0)[1]
as string) AS height#1969, cast(percentile_approx(name#1452, [0.25,0.5,0.75],
1, 0, 0)[2] as string) AS name#1971, cast(percentile_approx(age#1453,
[0.25,0.5,0.75], 1, 0, 0)[2] as string) AS age#1973,
cast(percentile_approx(height#1454, [0.25,0.5,0.75], 1, 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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