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From Julian Hyde <jh...@apache.org>
Subject Re: Rest adapter
Date Tue, 21 Feb 2017 01:41:58 GMT
By the way, credit where it is due - most of the work on the HTTP
adapter was by Henry Olson in the optiq-web project [1]. I have simply
upgraded it for recent Calcite.

Julian

[1] https://github.com/HenryOlson/optiq-web

On Mon, Feb 20, 2017 at 5:40 PM, Julian Hyde <jhyde@apache.org> wrote:
> Can you log a JIRA case for the REST adapter, and post your work as a
> pull request? Then I will take a look and try to debug it.
>
> I have been interested for some time in creating a REST adapter. I
> think it should be an evolution of the CSV adapter to work over other
> file formats and via protocols such as HTTP in addition to files. I
> have been working on https://issues.apache.org/jira/browse/CALCITE-884
> for some time, and my work in progress [
> https://github.com/julianhyde/calcite/tree/884-file-adapter ] almost
> passes all tests. It might be worth basing your adapter on that.
>
> Julian
>
> On Sun, Feb 19, 2017 at 7:55 PM, ravi katkar <ravikatkar.sun@gmail.com> wrote:
>> Hi,
>>
>> I am trying to write adapter for rest data source, where  I have a
>> requirement to fetch  where clause filters and selected column as query
>> parameters to rest resources.
>>
>> I have gone through adapters examples like web adapter, CSV adapter.
>>
>>
>>
>> I have created a table which implements TranslatableTable, FilterableTable
>>
>>
>>
>>
>>
>> *public class REST*TranslatableTable *extends REST*Table
>>
>>         *implements *TranslatableTable, FilterableTable {…
>>
>>
>>
>> in scan method I  could able to read the filters in where clause
>>
>>
>>
>> and
>>
>>
>>
>> *public class REST*TableScan *extends *TableScan *implements *EnumerableRel {
>>
>>
>>
>> in project method I could able to fetch fields used in the query
>>
>> *public *RelNode project(ImmutableBitSet fieldsUsed,
>>
>>                        Set<RelDataTypeField> extraFields,
>>
>>                        RelBuilder relBuilder) {
>>
>>
>>
>> *but when I have query without where clause *
>>
>> *eg: select col1, col2 from table1 *implement method is throwing error.
>>
>>
>>
>> I have tried similar approach in CSV adapter , I got same error, I think
>>
>> *public *Result implement(EnumerableRelImplementor implementor, Prefer
>> pref)  has to improved , any ideas how to proceed on this blocking
>> issue
>>
>>
>>
>>
>>
>> implement method is throwing error.
>>
>>
>>
>> java.sql.SQLException: Error while executing SQL "select empno,
>> slacker from emps ": while resolving method 'project' in class
>> org.apache.calcite.linq4j.Enumerable<java.lang.Object[]>
>>
>>
>>
>>            at org.apache.calcite.avatica.Helper.createException(Helper.java:56)
>>
>>            at org.apache.calcite.avatica.Helper.createException(Helper.java:41)
>>
>>            at org.apache.calcite.avatica.AvaticaStatement.executeInternal(AvaticaStatement.java:156)
>>
>>            at org.apache.calcite.avatica.AvaticaStatement.executeQuery(AvaticaStatement.java:218)
>>
>>            at org.apache.calcite.test.CsvTest.checkSql(CsvTest.java:321)
>>
>>            at org.apache.calcite.test.CsvTest.checkSql(CsvTest.java:291)
>>
>>            at org.apache.calcite.test.CsvTest.testBoolean(CsvTest.java:394)
>>
>>            at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>>
>>            at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
>>
>>            at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>>
>>            at java.lang.reflect.Method.invoke(Method.java:498)
>>
>>            at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
>>
>>            at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
>>
>>            at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
>>
>>            at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
>>
>>            at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
>>
>>            at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
>>
>>            at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
>>
>>            at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
>>
>>            at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
>>
>>            at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
>>
>>            at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
>>
>>            at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
>>
>>            at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
>>
>>            at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
>>
>>            at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
>>
>>            at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234)
>>
>>            at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74)
>>
>> Caused by: java.lang.RuntimeException: while resolving method
>> 'project' in class
>> org.apache.calcite.linq4j.Enumerable<java.lang.Object[]>
>>
>>            at org.apache.calcite.linq4j.tree.Expressions.call(Expressions.java:421)
>>
>>            at org.apache.calcite.linq4j.tree.Expressions.call(Expressions.java:432)
>>
>>            at org.apache.calcite.adapter.csv.CsvTableScan.implement(CsvTableScan.java:100)
>>
>>            at org.apache.calcite.adapter.enumerable.EnumerableRelImplementor.implementRoot(EnumerableRelImplementor.java:102)
>>
>>            at org.apache.calcite.adapter.enumerable.EnumerableInterpretable.toBindable(EnumerableInterpretable.java:92)
>>
>>            at org.apache.calcite.prepare.CalcitePrepareImpl$CalcitePreparingStmt.implement(CalcitePrepareImpl.java:1202)
>>
>>            at org.apache.calcite.prepare.Prepare.prepareSql(Prepare.java:298)
>>
>>            at org.apache.calcite.prepare.Prepare.prepareSql(Prepare.java:195)
>>
>>            at org.apache.calcite.prepare.CalcitePrepareImpl.prepare2_(CalcitePrepareImpl.java:735)
>>
>>            at org.apache.calcite.prepare.CalcitePrepareImpl.prepare_(CalcitePrepareImpl.java:598)
>>
>>            at org.apache.calcite.prepare.CalcitePrepareImpl.prepareSql(CalcitePrepareImpl.java:568)
>>
>>            at org.apache.calcite.jdbc.CalciteConnectionImpl.parseQuery(CalciteConnectionImpl.java:215)
>>
>>            at org.apache.calcite.jdbc.CalciteMetaImpl.prepareAndExecute(CalciteMetaImpl.java:594)
>>
>>            at org.apache.calcite.avatica.AvaticaConnection.prepareAndExecuteInternal(AvaticaConnection.java:615)
>>
>>            at org.apache.calcite.avatica.AvaticaStatement.executeInternal(AvaticaStatement.java:148)
>>
>>            ... 25 more
>>
>> Caused by: java.lang.NoSuchMethodException:
>> org.apache.calcite.linq4j.Enumerable.project(org.apache.calcite.DataContext,
>> [I)
>>
>>            at java.lang.Class.getMethod(Class.java:1786)
>>
>>            at org.apache.calcite.linq4j.tree.Expressions.call(Expressions.java:418)
>>
>>            ... 39 more
>>
>>
>>
>>
>>
>>
>>
>>  Thanks,
>>
>> Ravi katkar

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