> 在 2020年5月14日，上午11:12，zzh...@foxmail.com 写道：
>
> 非常感谢Benchao Li，使用UDF测试通过，SQL示例如下：
>
> CREATE TABLE session_login (
> ,deal_time BIGINT
> ,deal_time_obj as DY_FROM_UNIXTIME(deal_time*1000)
> ,WATERMARK FOR deal_time_obj AS deal_time_obj - INTERVAL '60' SECOND
> )WITH(
> ......
> )
>
> 其中DY_FROM_UNIXTIME负责将long转成timestamp类型
>
> oliver zhang,云长
> zzh...@foxmail.com
>
> 发件人： Benchao Li
> 发送时间： 2020-05-14 10:23
> 收件人： user-zh
> 主题： Re: SQL DDL怎样使用Long类型的时间戳作为事件时间
> 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。
>
> zzh...@foxmail.com <zzh...@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
>>
>>
>>
>> zzh...@foxmail.com
>
>
>
> --
>
> Benchao Li
> School of Electronics Engineering and Computer Science, Peking University
> Tel:+86-15650713730
> Email: libenc...@gmail.com; libenc...@pku.edu.cn
