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https://issues.apache.org/jira/browse/FLINK-8173?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16272512#comment-16272512
]
Fabian Hueske commented on FLINK-8173:
--------------------------------------
Yes, you should change {{toAppendStream[org.apache.avro.util.Utf8]}} to
{{toAppendStream\[java.lang.CharSequence\]}} or perform a manual casting with a
scalar UDF.
The support for Avro objects should be improved by converting `CharSequence` to
`String` to be able to use it as a VARCHAR (String) field, but then you'd get
the same error message but with String instead of CharSequence (see FLINK-8175)
Btw. I tried to reproduce the error with Flink 1.4.0 and got a much better
error message.
> InvalidProgramException: Table program cannot be compiled. This is a bug.
> Please file an issue.
> -----------------------------------------------------------------------------------------------
>
> Key: FLINK-8173
> URL: https://issues.apache.org/jira/browse/FLINK-8173
> Project: Flink
> Issue Type: Bug
> Reporter: Tao Xia
>
> It is a stream of Avro objects, simply select a String field and trying to
> print out
> val query = "SELECT nd_key FROM table1"
> val result = tableEnv.sql(query)
> tableEnv.toAppendStream[org.apache.avro.util.Utf8](result).print()
> 11/29/2017 16:07:36 Source: Custom Source -> from: (accepted_cohort_id,
> admin_id, after_submission, amount_paid, anonymous_id, application_id,
> atom_key, bd_group_key, biz_geo, braavos_purchase_id, category, cohort_id,
> concept_key, concept_rank, context, context_campaign, context_experiment,
> coupon_code, course_key, course_rank, cta_destination, cta_location,
> cta_message, cta_type, currency, decision_group_id, device_browser,
> device_os, device_os_version, device_type, duration, evaluation_id,
> event_type, fin_geo, in_collaboration_with, lab_id, lab_rank, label,
> lesson_key, lesson_rank, locale, max_pause_duration, message, message_id,
> module_key, module_rank, nd_key, nd_unit_id, nd_unit_rank, new_cohort_id,
> notification_id, num_concepts_completed, num_interactions,
> num_lessons_completed, old_cohort_id, part_key, part_rank, pause_duration,
> pause_reason, payment_plan, payment_provider, points_earned, points_possible,
> price, price_sheet, product_key, product_type, provider_charge_id,
> provider_refund_id, quiz_type, referrer, refund_amount, requested_cohort_id,
> results, scholarship_group_key, search_term, skill_level, subscription_id,
> suspension_length, suspension_reason, technology, timestamp, total_concepts,
> total_lessons, total_time_sec, type, unenroll_reason, user_id, user_locale,
> user_response, variant, version, workspace_id, workspace_session,
> workspace_type) -> select: (nd_key) -> to: Utf8 -> Sink: Unnamed(5/8)
> switched to FAILED
> org.apache.flink.api.common.InvalidProgramException: Table program cannot be
> compiled. This is a bug. Please file an issue.
> at
> org.apache.flink.table.codegen.Compiler$class.compile(Compiler.scala:36)
> at
> org.apache.flink.table.runtime.CRowOutputMapRunner.compile(CRowOutputMapRunner.scala:33)
> at
> org.apache.flink.table.runtime.CRowOutputMapRunner.open(CRowOutputMapRunner.scala:48)
> at
> org.apache.flink.api.common.functions.util.FunctionUtils.openFunction(FunctionUtils.java:36)
> at
> org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.open(AbstractUdfStreamOperator.java:111)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.openAllOperators(StreamTask.java:376)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:253)
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:702)
> at java.lang.Thread.run(Thread.java:748)
> Caused by: org.codehaus.commons.compiler.CompileException: Line 790, Column
> 15: Assignment conversion not possible from type "java.lang.CharSequence" to
> type "org.apache.avro.util.Utf8"
> at
> org.codehaus.janino.UnitCompiler.compileError(UnitCompiler.java:11672)
> at
> org.codehaus.janino.UnitCompiler.assignmentConversion(UnitCompiler.java:10528)
> at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:2534)
> at org.codehaus.janino.UnitCompiler.access$2600(UnitCompiler.java:212)
> at
> org.codehaus.janino.UnitCompiler$6.visitLocalVariableDeclarationStatement(UnitCompiler.java:1459)
> at
> org.codehaus.janino.UnitCompiler$6.visitLocalVariableDeclarationStatement(UnitCompiler.java:1443)
> at
> org.codehaus.janino.Java$LocalVariableDeclarationStatement.accept(Java.java:3348)
> at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:1443)
> at
> org.codehaus.janino.UnitCompiler.compileStatements(UnitCompiler.java:1523)
> at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:3052)
> at
> org.codehaus.janino.UnitCompiler.compileDeclaredMethods(UnitCompiler.java:1313)
> at
> org.codehaus.janino.UnitCompiler.compileDeclaredMethods(UnitCompiler.java:1286)
> at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:785)
> at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:436)
> at org.codehaus.janino.UnitCompiler.access$400(UnitCompiler.java:212)
> at
> org.codehaus.janino.UnitCompiler$2.visitPackageMemberClassDeclaration(UnitCompiler.java:390)
> at
> org.codehaus.janino.UnitCompiler$2.visitPackageMemberClassDeclaration(UnitCompiler.java:385)
> at
> org.codehaus.janino.Java$PackageMemberClassDeclaration.accept(Java.java:1405)
> at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:385)
> at org.codehaus.janino.UnitCompiler.compileUnit(UnitCompiler.java:357)
> at org.codehaus.janino.SimpleCompiler.cook(SimpleCompiler.java:234)
> at
> org.codehaus.janino.SimpleCompiler.compileToClassLoader(SimpleCompiler.java:446)
> at org.codehaus.janino.SimpleCompiler.cook(SimpleCompiler.java:213)
> at org.codehaus.janino.SimpleCompiler.cook(SimpleCompiler.java:204)
> at org.codehaus.commons.compiler.Cookable.cook(Cookable.java:80)
> at org.codehaus.commons.compiler.Cookable.cook(Cookable.java:75)
> at
> org.apache.flink.table.codegen.Compiler$class.compile(Compiler.scala:33)
> ... 8 more
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