Casting types with leading or trailing spaces
Learn about the fix to resolve inconsistent CAST behavior while casting string to numeric data types that have leading or trailing whitespace characters.
Before upgrade to CDP
select cast(' 1 ' as tinyint), cast(' 1 ' as smallint), cast(' 1 ' as int), cast(' 1 ' as bigint), cast(' 1 ' as float), cast(' 1 ' as double), cast(' 1 ' as decimal(10,2))
NULL NULL NULL NULL 1.0 1.0 1
The numeric data types, such as tinyint, smallint, int, and bigint were not converted correctly because of leading and trailing spaces and returned NULL. However, float, double, and decimal returned the correct output.
After upgrade to CDP
HIVE-17782 provides the fix to ensure consistent cast behavior across data types. The fix trims leading or trailing spaces in the string value before passing the value to the number formatter.