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From ravi katkar <ravikatkar....@gmail.com>
Subject Rest adapter
Date Mon, 20 Feb 2017 03:55:24 GMT
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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