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https://issues.apache.org/jira/browse/HIVE-5520?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xuefu Zhang updated HIVE-5520:
------------------------------
Attachment: HIVE-5520.1.patch
Patch #1 included additional refactoring and test case fixes.
> Use factory methods to instantiate HiveDecimal instead of constructors
> ----------------------------------------------------------------------
>
> Key: HIVE-5520
> URL: https://issues.apache.org/jira/browse/HIVE-5520
> Project: Hive
> Issue Type: Improvement
> Components: Types
> Affects Versions: 0.11.0
> Reporter: Xuefu Zhang
> Assignee: Xuefu Zhang
> Fix For: 0.13.0
>
> Attachments: HIVE-5520.1.patch, HIVE-5520.patch
>
>
> Currently HiveDecimal class provided a bunch of constructors that
> unfortunately also throws a runtime exception. For example,
> {code}
> public HiveDecimal(BigInteger unscaled, int scale) {
> bd = this.normalize(new BigDecimal(unscaled, scale), MAX_PRECISION,
> false);
> if (bd == null) {
> throw new NumberFormatException("Assignment would result in truncation");
> }
> {code}
> As a result, it's hard for the caller to detect error occurrences and the
> error handling is also complicated. In many cases, the error handling is
> omitted or missed. For instance,
> {code}
> HiveDecimalWritable result = new
> HiveDecimalWritable(HiveDecimal.ZERO);
> try {
> result.set(aggregation.sum.divide(new
> HiveDecimal(aggregation.count)));
> } catch (NumberFormatException e) {
> result = null;
> }
> {code}
> Throwing runtime exception while expecting caller to catch seems
> anti-pattern. In the case of constructor, factory class or methods seem more
> appropriate. With such a change, the apis are cleaner, and the error handling
> is simplified.
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