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https://issues.apache.org/jira/browse/DRILL-2101?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14302567#comment-14302567
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Victoria Markman commented on DRILL-2101:
-----------------------------------------
Changed priority to "Blocker" - need to be able to run tests with NULL values
in parquet files on decimal columns.
> Incorrect data type is written to parquet file when NULL is cast to decimal
> ---------------------------------------------------------------------------
>
> Key: DRILL-2101
> URL: https://issues.apache.org/jira/browse/DRILL-2101
> Project: Apache Drill
> Issue Type: Bug
> Affects Versions: 0.8.0
> Reporter: Victoria Markman
> Assignee: Mehant Baid
> Priority: Blocker
>
> {code}
> create table t1(c1) as
> select
> cast(null as decimal(28,4))
> from `t1.csv`;
> message root {
> optional double c1; <-- Wrong, should be decimal
> }
> {code}
> This is very commonly used construct to convert csv files to parquet files,
> that's why I'm marking this bug as critical.
> {code}
> create table t2 as
> select
> case when columns[3] = '' then cast(null as decimal(28,4)) else
> cast(columns[3] as decimal(28, 4)) end
> from `t1.csv`;
> {code}
> Correct - cast string literal to decimal
> {code}
> create table t3(c1) as
> select
> cast('12345678901234567890.1234' as decimal(28,4))
> from `t1.csv`;
> message root {
> required fixed_len_byte_array(12) c1 (DECIMAL(28,4));
> }
> {code}
> Correct - cast literal from csv file as decimal
> {code}
> create table t4(c1) as
> select
> cast(columns[3] as decimal(28,4))
> from `t1.csv`;
> message root {
> optional fixed_len_byte_array(12) c1 (DECIMAL(28,4));
> }
> {code}
> Correct - case statement (no null involved)
> {code}
> create table t5(c1) as
> select
> case when columns[3] = '' then cast('1111' as decimal(28,4)) else
> cast(columns[3] as decimal(28,4)) end
> from `t1.csv`;
> message root {
> optional fixed_len_byte_array(12) c1 (DECIMAL(28,4));
> }
> {code}
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