yaooqinn commented on PR #38151:
URL: https://github.com/apache/spark/pull/38151#issuecomment-1274182525
```scala
withTempPath { dir =>
withTable("t") {
sql("SELECT '12' as col1, '12' as
col2").write.format(format).save(dir.toString)
sql(s"CREATE TABLE t (col1 char(3), col2 varchar(3)) using $format")
sql(s"ALTER TABLE t SET LOCATION '$dir'")
checkAnswer(spark.sql("select concat(col1, col2) from t"), Row("12
12"))
}
}
```
I mean a test case like the above. W/ this PR, the 1st case below is a
behavior change that needs a doc or unit test.
```
// length fits
12 + 12 = 12<space>12
// length overflow w/ significant characters
1234 + 12 = 1234
// length overflow w/ spaces
12<space><space> + 12 = 12<space><space>34
```
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