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From Benchao Li <libenc...@gmail.com>
Subject Re: SQL DDL怎样使用Long类型的时间戳作为事件时间
Date Thu, 14 May 2020 02:23:47 GMT
你可以通过计算列写一个udf把long转成timestamp类型,在这个计算列上定义watermark就可以了。

zzhbwh@foxmail.com <zzhbwh@foxmail.com> 于2020年5月14日周四 上午10:02写道:

> Hi,all
>     kafka消息中存在消息的时间是Long类型,既有也有秒值,毫秒值,
> 我的问题是:
> 1、对于Long类型的时间数据,Flink SQL DDL现在怎样定义,才能使用WATERMARK
> 2、如果没有,后期是否有相应的规划
>
> 测试版本:Flink 1.10
>
>
> 在Flink 1.10中测试SQL如下:
> CREATE TABLE session_login (
>     deal_time TIMESTAMP(3)
>     ,aaVARCHAR
>     ,WATERMARK FOR deal_time AS deal_time - INTERVAL '60' SECOND
>  )WITH(
>     'connector.type' = 'kafka',
>     'connector.version' = 'universal',
>     'connector.topic' = 'topic',
>     'connector.startup-mode' = 'latest-offset',
>     'connector.properties.group.id' = 'group.id',
>     'connector.properties.zookeeper.connect' = 'ip:port',
>     'connector.properties.bootstrap.servers' = 'ip:port',
>     'format.type' = 'json',
>     'format.derive-schema' = 'true'
>  );
>
> 如果将deal_time定义为TIMESTAMP(3),JSON反序列化会提示如下异常:
> Caused by: java.io.IOException: Failed to deserialize JSON object.
> at
> org.apache.flink.formats.json.JsonRowDeserializationSchema.deserialize(JsonRowDeserializationSchema.java:133)
> at
> org.apache.flink.formats.json.JsonRowDeserializationSchema.deserialize(JsonRowDeserializationSchema.java:76)
> at
> org.apache.flink.streaming.connectors.kafka.internals.KafkaDeserializationSchemaWrapper.deserialize(KafkaDeserializationSchemaWrapper.java:45)
> at
> org.apache.flink.streaming.connectors.kafka.internal.KafkaFetcher.runFetchLoop(KafkaFetcher.java:140)
> at
> org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase.run(FlinkKafkaConsumerBase.java:715)
> at
> org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:100)
> at
> org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:63)
> at
> org.apache.flink.streaming.runtime.tasks.SourceStreamTask$LegacySourceFunctionThread.run(SourceStreamTask.java:196)
> Caused by: java.time.format.DateTimeParseException: Text '1589420545'
> could not be parsed at index 0
> at
> java.time.format.DateTimeFormatter.parseResolved0(DateTimeFormatter.java:1949)
> at java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1777)
> at
> org.apache.flink.formats.json.JsonRowDeserializationSchema.convertToLocalDateTime(JsonRowDeserializationSchema.java:366)
> at
> org.apache.flink.formats.json.JsonRowDeserializationSchema.lambda$wrapIntoNullableConverter$d586c97$1(JsonRowDeserializationSchema.java:236)
> at
> org.apache.flink.formats.json.JsonRowDeserializationSchema.convertField(JsonRowDeserializationSchema.java:439)
> at
> org.apache.flink.formats.json.JsonRowDeserializationSchema.lambda$assembleRowConverter$77f7700$1(JsonRowDeserializationSchema.java:418)
> at
> org.apache.flink.formats.json.JsonRowDeserializationSchema.lambda$wrapIntoNullableConverter$d586c97$1(JsonRowDeserializationSchema.java:236)
> at
> org.apache.flink.formats.json.JsonRowDeserializationSchema.deserialize(JsonRowDeserializationSchema.java:131)
> ... 7 more
>
> 如果将deal_time定义成BIGINT,SQL校验失败,提示异常如下:
> Exception in thread "main"
> org.apache.calcite.runtime.CalciteContextException: From line 4, column 33
> to line 4, column 64: Cannot apply '-' to arguments of type '<BIGINT> -
> <INTERVAL SECOND>'. Supported form(s): '<NUMERIC> - <NUMERIC>'
> '<DATETIME_INTERVAL> - <DATETIME_INTERVAL>'
> '<DATETIME> - <DATETIME_INTERVAL>'
>         at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
> Method)
>         at
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
>         at
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
>         at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
>         at
> org.apache.calcite.runtime.Resources$ExInstWithCause.ex(Resources.java:463)
>         at
> org.apache.calcite.sql.SqlUtil.newContextException(SqlUtil.java:834)
>         at
> org.apache.calcite.sql.SqlUtil.newContextException(SqlUtil.java:819)
>         at
> org.apache.calcite.sql.validate.SqlValidatorImpl.newValidationError(SqlValidatorImpl.java:4840)
>         at
> org.apache.calcite.sql.SqlCallBinding.newValidationSignatureError(SqlCallBinding.java:280)
>         at
> org.apache.calcite.sql.type.FamilyOperandTypeChecker.checkSingleOperandType(FamilyOperandTypeChecker.java:96)
>         at
> org.apache.calcite.sql.type.FamilyOperandTypeChecker.checkOperandTypes(FamilyOperandTypeChecker.java:130)
>         at
> org.apache.calcite.sql.type.CompositeOperandTypeChecker.checkOperandTypes(CompositeOperandTypeChecker.java:255)
>         at
> org.apache.calcite.sql.SqlOperator.checkOperandTypes(SqlOperator.java:668)
>         at
> org.apache.calcite.sql.SqlOperator.validateOperands(SqlOperator.java:432)
>         at
> org.apache.calcite.sql.SqlOperator.deriveType(SqlOperator.java:518)
>         at
> org.apache.calcite.sql.SqlBinaryOperator.deriveType(SqlBinaryOperator.java:144)
>         at
> org.apache.calcite.sql.validate.SqlValidatorImpl$DeriveTypeVisitor.visit(SqlValidatorImpl.java:5599)
>         at
> org.apache.calcite.sql.validate.SqlValidatorImpl$DeriveTypeVisitor.visit(SqlValidatorImpl.java:5586)
>         at org.apache.calcite.sql.SqlCall.accept(SqlCall.java:139)
>         at
> org.apache.calcite.sql.validate.SqlValidatorImpl.deriveTypeImpl(SqlValidatorImpl.java:1690)
>         at
> org.apache.calcite.sql.validate.SqlValidatorImpl.deriveType(SqlValidatorImpl.java:1675)
>         at
> org.apache.calcite.sql.validate.SqlValidatorImpl.validateScopedExpression(SqlValidatorImpl.java:946)
>         at
> org.apache.calcite.sql.validate.SqlValidatorImpl.validateParameterizedExpression(SqlValidatorImpl.java:929)
>         at
> org.apache.flink.table.planner.operations.SqlToOperationConverter.lambda$createTableSchema$8(SqlToOperationConverter.java:509)
>         at java.util.Optional.ifPresent(Optional.java:159)
>         at
> org.apache.flink.table.planner.operations.SqlToOperationConverter.createTableSchema(SqlToOperationConverter.java:505)
>         at
> org.apache.flink.table.planner.operations.SqlToOperationConverter.convertCreateTable(SqlToOperationConverter.java:177)
>         at
> org.apache.flink.table.planner.operations.SqlToOperationConverter.convert(SqlToOperationConverter.java:130)
>         at
> org.apache.flink.table.planner.delegation.ParserImpl.parse(ParserImpl.java:66)
>         at
> org.apache.flink.table.api.internal.TableEnvironmentImpl.sqlUpdate(TableEnvironmentImpl.java:484)
>         at
> com.douyu.ocean.flink.streaming.core.Main.callCreateTable(Main.java:169)
>         at
> com.douyu.ocean.flink.streaming.core.Main.callCommand(Main.java:149)
>         at com.douyu.ocean.flink.streaming.core.Main.run(Main.java:108)
>         at com.douyu.ocean.flink.streaming.core.Main.main(Main.java:47)
> Caused by: org.apache.calcite.sql.validate.SqlValidatorException: Cannot
> apply '-' to arguments of type '<BIGINT> - <INTERVAL SECOND>'. Supported
> form(s): '<NUMERIC> - <NUMERIC>'
> '<DATETIME_INTERVAL> - <DATETIME_INTERVAL>'
> '<DATETIME> - <DATETIME_INTERVAL>'
>         at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
> Method)
>         at
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
>         at
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
>         at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
>         at
> org.apache.calcite.runtime.Resources$ExInstWithCause.ex(Resources.java:463)
>         at
> org.apache.calcite.runtime.Resources$ExInst.ex(Resources.java:572)
>         ... 29 more
>
>
>
> zzhbwh@foxmail.com



-- 

Benchao Li
School of Electronics Engineering and Computer Science, Peking University
Tel:+86-15650713730
Email: libenchao@gmail.com; libenchao@pku.edu.cn

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