GitHub user hsuanyi opened a pull request:
https://github.com/apache/drill/pull/397
Drill 4372 review
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/hsuanyi/incubator-drill DRILL-4372_Review
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/drill/pull/397.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #397
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commit 4c75fd6ae22e26dcac37d5da1f41020d25f885d8
Author: Sudheesh Katkam <skat...@maprtech.com>
Date: 2015-12-22T04:38:59Z
Validate Drill functions (argument and return types). WIP.
commit 4aa34bf41982a4491f6eea347165436fe9dfd853
Author: Hsuan-Yi Chu <hsua...@usc.edu>
Date: 2015-12-30T22:21:10Z
DRILL-4372: Expose the functions return type to Drill
- Drill-Calite version update:
This commit needs to have Calcite's patch (CALCITE-1062) to plugin
customized SqlOperator.
- FunctionTemplate
Add FunctionArgumentNumber annotation. This annotation element tells if the
number of argument(s) is fixed or arbitrary (e.g., String concatenation
function).
Due to this modification, there are some minor changes in DrillFuncHolder,
DrillFunctionRegistry and FunctionAttributes.
- Checker
Add a new Checker (which Calcite uses to validate the legitimacy of the
number of argument(s) for a function) to allow functions with arbitrary
arguments to pass Caclite's validation
- Type conversion between Drill and Calcite
DrillConstExector is given a static method getDrillTypeFromCalcite() to
convert Calcite types to Drill's.
- Extract function's return type inference
Unlike other functions, Extract function's return type can be determined
solely based on the first argument. A logic is added in to allow this inference
to happen
- DrillCalcite wrapper:
From the aspects of return type inference and argument type checks,
Calcite's mechanism is very different from Drill's. In addition, currently,
there is no straightforward way for Drill to plug-in customized mechanisms to
Calcite. Thus, wrappers are provided to serve the objective.
Except for the mechanisms of type inference and argument type checks, these
wrappers just forward any method calls to the wrapped SqlOpertor, SqlFuncion or
SqlAggFunction to respond.
A interface DrillCalciteSqlWrapper is also added for the callers of the
three wrappers to get the wrapped objects easier.
Due to these wrappers, UnsupportedOperatorsVisitor is modified in a minor
manner.
- Calcite's SqlOpertor, SqlFuncion or SqlAggFunction are wrapped in
DrillOperatorTable
Instead of returning Caclite's native SqlOpertor, SqlFuncion or
SqlAggFunction, return the wrapped ones to ensure customized behaviors can be
adopted.
- Type inference mechanism
This mechanism is used across all SqlOpertor, SqlFuncion or SqlAggFunction.
Thus, it is factored out as its own method in TypeInferenceUtils
- Upgrade Drill-Calcite
Bump version number to 1.4.0-drill-test-r15
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