glon commented on issue #10063:
URL:
https://github.com/apache/shardingsphere/issues/10063#issuecomment-819180886
1. We've set `sql.show = true`
When executing `select * from city`, could not get the answer, and the
selected database will lost, like :
```
sharding_user@localhost:6033 [sharding_db]>select * from city;
Query OK, 0 rows affected, 25971 warnings (0.01 sec)
sharding_user@localhost:6033 [(none)]>
```
Here's the logs/stdout.log recording when executing the SQL :
```
[INFO ] 10:37:36.364 [ShardingSphere-Command-4] ShardingSphere-SQL - Logic
SQL: select * from city
[INFO ] 10:37:36.364 [ShardingSphere-Command-4] ShardingSphere-SQL -
SQLStatement:
SelectStatementContext(super=CommonSQLStatementContext(sqlStatement=org.apache.shardingsphere.sql.parser.sql.statement.dml.SelectStatement@4c958aed,
tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@4365ad34),
tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@4365ad34,
projectionsContext=ProjectionsContext(startIndex=7, stopIndex=7,
distinctRow=false, projections=[ShorthandProjection(owner=Optional.empty,
actualColumns=[])]),
groupByContext=org.apache.shardingsphere.sql.parser.binder.segment.select.groupby.GroupByContext@25372307,
orderByContext=org.apache.shardingsphere.sql.parser.binder.segment.select.orderby.OrderByContext@35e56d5a,
paginationContext=org.apache.shardingsphere.sql.parser.binder.segment.select.pagination.PaginationContext@55474be9,
containsSubquery=false)
[INFO ] 10:37:36.364 [ShardingSphere-Command-4] ShardingSphere-SQL - Actual
SQL: ds_0 ::: select * from city
[WARN ] 10:37:36.364 [ShardingSphere-Command-4]
com.zaxxer.hikari.pool.PoolBase - HikariPool-1 - Failed to validate connection
com.mysql.jdbc.JDBC4Connection@3ba54078 (No operations allowed after connection
closed.). Possibly consider using a shorter maxLifetime value.
[ERROR] 10:37:36.500 [ShardingSphere-Command-4]
o.a.s.s.f.c.CommandExecutorTask - Exception occur:
java.lang.NullPointerException: null
at com.mysql.jdbc.ResultSetImpl.next(ResultSetImpl.java:6300)
at
com.zaxxer.hikari.pool.HikariProxyResultSet.next(HikariProxyResultSet.java)
at
org.apache.shardingsphere.sharding.execute.sql.execute.result.StreamQueryResult.next(StreamQueryResult.java:50)
at
org.apache.shardingsphere.sharding.merge.dql.iterator.IteratorStreamMergedResult.next(IteratorStreamMergedResult.java:41)
at
org.apache.shardingsphere.shardingproxy.backend.communication.jdbc.JDBCDatabaseCommunicationEngine.next(JDBCDatabaseCommunicationEngine.java:138)
at
org.apache.shardingsphere.shardingproxy.backend.text.query.QueryBackendHandler.next(QueryBackendHandler.java:57)
at
org.apache.shardingsphere.shardingproxy.frontend.mysql.command.query.text.query.MySQLComQueryPacketExecutor.next(MySQLComQueryPacketExecutor.java:135)
at
org.apache.shardingsphere.shardingproxy.frontend.mysql.command.MySQLCommandExecuteEngine.writeQueryData(MySQLCommandExecuteEngine.java:81)
at
org.apache.shardingsphere.shardingproxy.frontend.command.CommandExecutorTask.executeCommand(CommandExecutorTask.java:101)
at
org.apache.shardingsphere.shardingproxy.frontend.command.CommandExecutorTask.run(CommandExecutorTask.java:71)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
[INFO ] 10:37:36.501 [ShardingSphere-Command-5] ShardingSphere-SQL - Logic
SQL: SELECT DATABASE()
[INFO ] 10:37:36.501 [ShardingSphere-Command-5] ShardingSphere-SQL -
SQLStatement:
SelectStatementContext(super=CommonSQLStatementContext(sqlStatement=org.apache.shardingsphere.sql.parser.sql.statement.dml.SelectStatement@46fe6fd1,
tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@18a691b4),
tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@18a691b4,
projectionsContext=ProjectionsContext(startIndex=7, stopIndex=16,
distinctRow=false, projections=[ExpressionProjection(expression=DATABASE(),
alias=Optional.empty)]),
groupByContext=org.apache.shardingsphere.sql.parser.binder.segment.select.groupby.GroupByContext@7660743e,
orderByContext=org.apache.shardingsphere.sql.parser.binder.segment.select.orderby.OrderByContext@4a1ab3ef,
paginationContext=org.apache.shardingsphere.sql.parser.binder.segment.select.pagination.PaginationContext@7fafcd9a,
containsSubquery=false)
[INFO ] 10:37:36.501 [ShardingSphere-Command-5] ShardingSphere-SQL - Actual
SQL: ds_1 ::: SELECT DATABASE()
[WARN ] 10:37:36.501 [ShardingSphere-Command-5]
com.zaxxer.hikari.pool.PoolBase - HikariPool-2 - Failed to validate connection
com.mysql.jdbc.JDBC4Connection@5328c8ea (No operations allowed after connection
closed.). Possibly consider using a shorter maxLifetime value.
```
server.yaml :
```
authentication:
users:
root:
password: root
sharding:
password: sharding
authorizedSchemas: sharding_db
props:
max.connections.size.per.query: 9
acceptor.size: 16 # The default value is available processors count * 2.
executor.size: 16 # Infinite by default.
proxy.frontend.flush.threshold: 128 # The default value is 128.
proxy.transaction.type: LOCAL
proxy.opentracing.enabled: false
proxy.hint.enabled: false
query.with.cipher.column: true
sql.show: true
allow.range.query.with.inline.sharding: false
```
2. SQL like `select id, name from city`, `insert into city (id, name) values
(...)[,(...)]` work well.
`insert into city values (...)[,(...)]` does not work as well.
3. Other broadcast tables have the same problem, but sharding tables work
well.
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