[GitHub] [shardingsphere] FlyingZC opened a new issue, #18697: When multiple back quotation marks are used as a table name, the back quotation marks will be removed all

[GitBox]

FlyingZC opened a new issue, #18697:
URL: https://github.com/apache/shardingsphere/issues/18697

   ## Bug Report
   
   ### Which version of ShardingSphere did you use?
   `master`
   
   ### Which project did you use? ShardingSphere-JDBC or ShardingSphere-Proxy?
   `ShardingSphere-JDBC`
   
   ### Expected behavior
   keep correct quotation marks.
   
   ### Actual behavior
   When I want to support create table sql with multiple back quotes, like 
`CREATE TABLE ```ab````cd``` (i INT);`,the table name is resolved to `abcd`.
   
   ### Reason analyze (If you can)
   
`org.apache.shardingsphere.sql.parser.sql.common.value.identifier.IdentifierValue#IdentifierValue(java.lang.String)`
 uses the method 
`org.apache.shardingsphere.sql.parser.sql.common.util.SQLUtil#getExactlyValue(java.lang.String)`
 to handle table name,this method removes all back quotes.
   
   Before:
   <img width="1217" alt="image" 
src="https://user-images.githubusercontent.com/19788130/176399071-232fc5cc-38cb-417b-83dd-d46adba27152.png";>
   
   After:
   <img width="1265" alt="image" 
src="https://user-images.githubusercontent.com/19788130/176399199-a6d5478b-e34e-46fd-ad99-1ca3d28ff090.png";>
   
   The execution result of this sql in mysql:
   <img width="602" alt="image" 
src="https://user-images.githubusercontent.com/19788130/176399540-ac8c81b3-8ece-42a8-8ddd-0c5521b1ac27.png";>
   
   StackTrace:
   
   ```
   <init>:31, IdentifierValue 
(org.apache.shardingsphere.sql.parser.sql.common.value.identifier)
   <init>:41, IdentifierValue 
(org.apache.shardingsphere.sql.parser.sql.common.value.identifier)
   visitTableName:322, MySQLStatementSQLVisitor 
(org.apache.shardingsphere.sql.parser.mysql.visitor.statement.impl)
   visitTableName:223, MySQLStatementSQLVisitor 
(org.apache.shardingsphere.sql.parser.mysql.visitor.statement.impl)
   accept:31379, MySQLStatementParser$TableNameContext 
(org.apache.shardingsphere.sql.parser.autogen)
   visit:18, AbstractParseTreeVisitor (org.antlr.v4.runtime.tree)
   visitCreateTable:238, MySQLDDLStatementSQLVisitor 
(org.apache.shardingsphere.sql.parser.mysql.visitor.statement.impl)
   visitCreateTable:182, MySQLDDLStatementSQLVisitor 
(org.apache.shardingsphere.sql.parser.mysql.visitor.statement.impl)
   accept:1931, MySQLStatementParser$CreateTableContext 
(org.apache.shardingsphere.sql.parser.autogen)
   visit:55, SQLVisitorEngine (org.apache.shardingsphere.sql.parser.api)
   parseSQLStatement:78, SQLParserParameterizedTest 
(org.apache.shardingsphere.test.sql.parser.parameterized.engine)
   assertSupportedSQL:72, SQLParserParameterizedTest 
(org.apache.shardingsphere.test.sql.parser.parameterized.engine)
   invoke:-1, GeneratedMethodAccessor5 (sun.reflect)
   invoke:43, DelegatingMethodAccessorImpl (sun.reflect)
   invoke:498, Method (java.lang.reflect)
   runReflectiveCall:50, FrameworkMethod$1 (org.junit.runners.model)
   run:12, ReflectiveCallable (org.junit.internal.runners.model)
   invokeExplosively:47, FrameworkMethod (org.junit.runners.model)
   evaluate:17, InvokeMethod (org.junit.internal.runners.statements)
   runLeaf:325, ParentRunner (org.junit.runners)
   runChild:78, BlockJUnit4ClassRunner (org.junit.runners)
   runChild:57, BlockJUnit4ClassRunner (org.junit.runners)
   run:290, ParentRunner$3 (org.junit.runners)
   schedule:71, ParentRunner$1 (org.junit.runners)
   runChildren:288, ParentRunner (org.junit.runners)
   access$000:58, ParentRunner (org.junit.runners)
   evaluate:268, ParentRunner$2 (org.junit.runners)
   run:363, ParentRunner (org.junit.runners)
   runChild:128, Suite (org.junit.runners)
   runChild:27, Suite (org.junit.runners)
   run:290, ParentRunner$3 (org.junit.runners)
   schedule:71, ParentRunner$1 (org.junit.runners)
   runChildren:288, ParentRunner (org.junit.runners)
   access$000:58, ParentRunner (org.junit.runners)
   evaluate:268, ParentRunner$2 (org.junit.runners)
   run:363, ParentRunner (org.junit.runners)
   run:137, JUnitCore (org.junit.runner)
   startRunnerWithArgs:69, JUnit4IdeaTestRunner (com.intellij.junit4)
   execute:38, IdeaTestRunner$Repeater$1 (com.intellij.rt.junit)
   repeat:11, TestsRepeater (com.intellij.rt.execution.junit)
   startRunnerWithArgs:35, IdeaTestRunner$Repeater (com.intellij.rt.junit)
   prepareStreamsAndStart:235, JUnitStarter (com.intellij.rt.junit)
   main:54, JUnitStarter (com.intellij.rt.junit)
   ```
   
   ### Steps to reproduce the behavior, such as: SQL to execute, sharding rule 
configuration, when exception occur etc.
   
   ### Example codes for reproduce this issue (such as a github link).
   


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