DDL定义@timestamp字段问题提示org.apache.flink.table.api.SqlParserException

Fri, 22 May 2020 02:39:31 -0700 

hello，
使用版本 Flink 1.10
部分业务数据kafka数据存在字段`@timestamp`,
DDL如下：
CREATE TABLE kafkaSrc(
    `@timestamp` TIMESTAMP(3)
    ,domain VARCHAR
    ,proctime AS proctime()
 )WITH(
    'connector.type' = 'kafka',
    'connector.version' = 'universal',
    'connector.topic' = ’topic',
    'connector.startup-mode' = 'latest-offset',
    'connector.properties.group.id' = ‘id',
    'connector.properties.zookeeper.connect' = ‘xxx',
    'connector.properties.bootstrap.servers' = ‘xxx',
    'format.type' = 'json',
    'format.derive-schema' = 'true'
 );

如果DML为：
insert into MyResult
select
    ,`@timestamp`
    ,domain
    ,proctime
from
    kafkaSrc
;

则会提示SQL解析失败，异常如下：
Caused by: org.apache.flink.table.api.SqlParserException: SQL parse failed. 
Lexical error at line 1, column 8.  Encountered: "@" (64), after : ""
        at 
org.apache.flink.table.planner.calcite.CalciteParser.parse(CalciteParser.java:50)
        at 
org.apache.flink.table.planner.calcite.SqlExprToRexConverterImpl.convertToRexNodes(SqlExprToRexConverterImpl.java:79)
        at 
org.apache.flink.table.planner.plan.schema.CatalogSourceTable.toRel(CatalogSourceTable.scala:111)
        at 
org.apache.calcite.sql2rel.SqlToRelConverter.toRel(SqlToRelConverter.java:3328)
        at 
org.apache.calcite.sql2rel.SqlToRelConverter.convertIdentifier(SqlToRelConverter.java:2357)
        at 
org.apache.calcite.sql2rel.SqlToRelConverter.convertFrom(SqlToRelConverter.java:2051)
        at 
org.apache.calcite.sql2rel.SqlToRelConverter.convertFrom(SqlToRelConverter.java:2005)
        at 
org.apache.calcite.sql2rel.SqlToRelConverter.convertSelectImpl(SqlToRelConverter.java:646)
        at 
org.apache.calcite.sql2rel.SqlToRelConverter.convertSelect(SqlToRelConverter.java:627)
        at 
org.apache.calcite.sql2rel.SqlToRelConverter.convertQueryRecursive(SqlToRelConverter.java:3181)
        at 
org.apache.calcite.sql2rel.SqlToRelConverter.convertQuery(SqlToRelConverter.java:563)
        at 
org.apache.flink.table.planner.calcite.FlinkPlannerImpl.org$apache$flink$table$planner$calcite$FlinkPlannerImpl$$rel(FlinkPlannerImpl.scala:148)
        at 
org.apache.flink.table.planner.calcite.FlinkPlannerImpl.rel(FlinkPlannerImpl.scala:135)
        at 
org.apache.flink.table.planner.operations.SqlToOperationConverter.toQueryOperation(SqlToOperationConverter.java:522)
        at 
org.apache.flink.table.planner.operations.SqlToOperationConverter.convertSqlQuery(SqlToOperationConverter.java:436)
        at 
org.apache.flink.table.planner.operations.SqlToOperationConverter.convert(SqlToOperationConverter.java:154)
        at 
org.apache.flink.table.planner.operations.SqlToOperationConverter.convertSqlInsert(SqlToOperationConverter.java:342)
        at 
org.apache.flink.table.planner.operations.SqlToOperationConverter.convert(SqlToOperationConverter.java:142)
        at 
org.apache.flink.table.planner.delegation.ParserImpl.parse(ParserImpl.java:66)
        at 
org.apache.flink.table.api.internal.TableEnvironmentImpl.sqlUpdate(TableEnvironmentImpl.java:484)

Debug发现：
https://github.com/apache/flink/blob/release-1.10/flink-table/flink-table-planner-blink/src/main/java/org/apache/flink/table/planner/calcite/CalciteParser.java#L45-L52

函数：public SqlNode parse(String sql)入参sql的value是：SELECT 
@timestamp,domain,PROCTIME() FROM __temp_table__

图片地址：http://chuantu.xyz/t6/735/1590139759x2728303292.png

另外，去掉proctime AS proctime()，可以正常输出结果，不知道有没有帮助

Best,
Oliver 云长

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