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[DRILL-684] Use parquet row count in cost-based optimization.  Use parquet row count, column value count to optimize count() aggregate function. - Drill - [issue]
...Parquet group scan provides the exact row count and the exact value count for each individual column.  Such information could be leveraged in the following two ways:1. Use the count in ...
http://issues.apache.org/jira/browse/DRILL-684    Author: Jinfeng Ni, 2014-05-12, 00:14
[DRILL-580] Drill logical or physical rules should not specify child operand - Drill - [issue]
...Most of Drill logical and physical rules (implements RelOptRule) are essentially conversion rules.  For conversion rule, it's not required to specify the child operand in the rule's pat...
http://issues.apache.org/jira/browse/DRILL-580    Author: Jinfeng Ni, 2014-05-06, 23:53
[expand - 1 more] - Re: Review Request 20742: Allow implicit cast to be applied in both directions for certain data types - Drill - [mail # dev]
...This is an automatically generated e-mail. To reply, visit:https://reviews.apache.org/r/20742/#review42336Ship it!Ship It!- Jinfeng NiOn April 26, 2014, 12:40 a.m., Mehant Baid wrote: ...
   Author: Jinfeng Ni, 2014-05-06, 20:35
[DRILL-491] Support project push-down into scan operator - Drill - [issue]
...Currently, the scan operator will read all the columns from the data source, and pass all the columns to down-stream operator. In order to improve performance of Drill query, we should inste...
http://issues.apache.org/jira/browse/DRILL-491    Author: Jinfeng Ni, 2014-05-04, 17:58
[expand - 3 more] - Re: Review Request 20762: DRILL-491 : Push project into scan operator. - Drill - [mail # dev]
...Thanks! Now I enable the option of removing trailing white space and unused imports in Eclipse. This seems to be related to map, which is currently wip. I'll revisit this, if the design of m...
   Author: Jinfeng Ni, 2014-05-01, 01:31
[expand - 2 more] - Re: Review Request 20806: DRILL-571: Predicate push down into HBase scan - Drill - [mail # dev]
...What do you mean by "not traversing the expression tree"? I thought we use ExprVisitor, which will traverse the expr tree. so, for condition like "row_key = 'value1' or row_key = 'value2'", ...
   Author: Jinfeng Ni, 2014-04-29, 15:46
[expand - 1 more] - Re: Review Request 20804: DRILL-494: Filter Pushdown into Scan Operator - Drill - [mail # dev]
...Also, I feel the title of this JIRA probably is a bit misleading, since the most of the change is not about filter pushdown. In stead, the change is to provide the interface necessary to all...
   Author: Jinfeng Ni, 2014-04-29, 01:14
Re: Review Request 20741: Cost model to include distribution cost and enable new plans - Drill - [mail # dev]
...This is an automatically generated e-mail. To reply, visit:https://reviews.apache.org/r/20741/#review41572exec/java-exec/src/main/java/org/apache/drill/exec/planner/common/DrillFilterRelBase...
   Author: Jinfeng Ni, 2014-04-27, 23:28
[DRILL-379] Support part of commonly used String functions and Math functions in Drill. - Drill - [issue]
...We will add the support of some commonly used String functions and Math functions (over int, floating-point number). 1. like2. similar3. regexp_replace4. char_length4. oct_length5. bit_lengt...
http://issues.apache.org/jira/browse/DRILL-379    Author: Jinfeng Ni, 2014-04-20, 02:42
[DRILL-359] Drill client thread may hang forever, even after it receives all the expected data - Drill - [issue]
...Run a physical plan which contains union-exchange and broadcast-exchange. The client thread hangs there forever, even after it receives all the expected rows....
http://issues.apache.org/jira/browse/DRILL-359    Author: Jinfeng Ni, 2014-04-20, 02:40
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