Carter Shanklin created HIVE-17030:
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Summary: HPL/SQL: Many cast operations are ignored without warning
or notice.
Key: HIVE-17030
URL: https://issues.apache.org/jira/browse/HIVE-17030
Project: Hive
Issue Type: Bug
Components: hpl/sql
Reporter: Carter Shanklin
Priority: Critical
This bug is part of a series of issues and surprising behavior I encountered
writing a reporting script that would aggregate values and give rows different
classifications based on an the aggregate. Addressing some or all of these
issues would make HPL/SQL more accessible to newcomers.
Consider this code:
{code}
val1d := cast('10.0' as double);
val2d := cast('5.0' as double);
declare val1i int = 5;
declare val2i int = 5;
val1i = val1d;
diff := val1i - val2i;
{code}
What is the value of diff? You might think it is 5 but in fact it is 0. Why?
Because when you attempt to assign val1i to val1d, this code in Var.java is
executed:
{code}
else if (type == Type.BIGINT) {
if (val.type == Type.STRING) {
value = Long.parseLong((String)val.value);
}
}
else if (type == Type.DECIMAL) {
{code}
Since there is no case for assigning a double to a bigint, the expression is
essentially ignored and the value remains the same. This behavior leads to many
surprising results.
It would be best if HPL/SQL could re-use the cast code from Hive since there
are a lot of cases to consider.
Version = 3.0.0-SNAPSHOT r71f52d8ad512904b3f2c4f04fe39a33f2834f1f2
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