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From "Abhishek Girish (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-2332) Drill should be consistent with Implicit casting rules across data formats
Date Fri, 27 Feb 2015 02:39:04 GMT
Abhishek Girish created DRILL-2332:
--------------------------------------

             Summary: Drill should be consistent with Implicit casting rules across data formats
                 Key: DRILL-2332
                 URL: https://issues.apache.org/jira/browse/DRILL-2332
             Project: Apache Drill
          Issue Type: Improvement
          Components: Query Planning & Optimization
            Reporter: Abhishek Girish
            Assignee: Jinfeng Ni


Currently, the outcome of a query with a filter on a column comparing it with a literal, depends
on the underlying data format. 

*Parquet*
{code:sql}
select * from date_dim where d_month_seq ='1193' limit 1;
[Succeeds]

select * from date_dim where d_date in ('1999-06-30') limit 1;
[Succeeds]
{code}

*View on top of text:*
{code:sql}
select * from date_dim where d_date in ('1999-06-30') limit 1;
Query failed: SqlValidatorException: Values passed to IN operator must have compatible types

Error: exception while executing query: Failure while executing query. (state=,code=0)

select * from date_dim where d_month_seq ='1193' limit 1;
Query failed: SqlValidatorException: Cannot apply '=' to arguments of type '<INTEGER>
= <CHAR(4)>'. Supported form(s): '<COMPARABLE_TYPE> = <COMPARABLE_TYPE>'

Error: exception while executing query: Failure while executing query. (state=,code=0)
{code}

I understand that in the case of View on Text, SQL validation fails at the Optiq layer. 

But from the perspective of an end-user, Drill's behavior must be consistent across data formats.
Also having a view by definition should abstract out this information.

Here, both the view and parquet were created with type information. 

*Parquet-meta*
{code}
parquet-schema /mapr/abhi311/data/parquet/tpcds/scale1/date_dim/0_0_0.parquet 
message root {
  optional int32 d_date_sk;
  optional binary d_date_id (UTF8);
  optional binary d_date (UTF8);
  optional int32 d_month_seq;
  optional int32 d_week_seq;
  optional int32 d_quarter_seq;
  optional int32 d_year;
  optional int32 d_dow;
  optional int32 d_moy;
  optional int32 d_dom;
  optional int32 d_qoy;
  optional int32 d_fy_year;
  optional int32 d_fy_quarter_seq;
  optional int32 s_fy_week_seq;
  optional binary d_day_name (UTF8);
  optional binary d_quarter_name (UTF8);
  optional binary d_holiday (UTF8);
  optional binary d_weekend (UTF8);
  optional binary d_following_holiday (UTF8);
  optional int32 d_first_dom;
  optional int32 d_last_dom;
  optional int32 d_same_day_ly;
  optional int32 d_same_day_lq;
  optional binary d_current_day (UTF8);
  optional binary d_current_week (UTF8);
  optional binary d_current_month (UTF8);
  optional binary d_current_quarter (UTF8);
  optional binary d_current_year (UTF8);
}
{code}

*Describe View*
{code:sql}
> describe date_dim;
+-------------+------------+-------------+
| COLUMN_NAME | DATA_TYPE  | IS_NULLABLE |
+-------------+------------+-------------+
| d_date_sk   | INTEGER    | NO          |
| d_date_id   | VARCHAR    | NO          |
| d_date      | DATE       | NO          |
| d_month_seq | INTEGER    | NO          |
| d_week_seq  | INTEGER    | NO          |
| d_quarter_seq | INTEGER    | NO          |
| d_year      | INTEGER    | NO          |
| d_dow       | INTEGER    | NO          |
| d_moy       | INTEGER    | NO          |
| d_dom       | INTEGER    | NO          |
| d_qoy       | INTEGER    | NO          |
| d_fy_year   | INTEGER    | NO          |
| d_fy_quarter_seq | INTEGER    | NO          |
| s_fy_week_seq | INTEGER    | NO          |
| d_day_name  | VARCHAR    | NO          |
| d_quarter_name | VARCHAR    | NO          |
| d_holiday   | VARCHAR    | NO          |
| d_weekend   | VARCHAR    | NO          |
| d_following_holiday | VARCHAR    | NO          |
| d_first_dom | INTEGER    | NO          |
| d_last_dom  | INTEGER    | NO          |
| d_same_day_ly | INTEGER    | NO          |
| d_same_day_lq | INTEGER    | NO          |
| d_current_day | VARCHAR    | NO          |
| d_current_week | VARCHAR    | NO          |
| d_current_month | VARCHAR    | NO          |
| d_current_quarter | VARCHAR    | NO          |
| d_current_year | VARCHAR    | NO          |
+-------------+------------+-------------+
28 rows selected (0.137 seconds)
{code}



For an end



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