* Rename MetaDataContexts

* Rename package name

* Remove useless ReplicaQueryTableAddressingMetaDataDecorator

* Switch class name of ShardingSphereMetaData and ShardingSphereSchema

* Decouple SQLStatementParserEngine

* Remove SQLStatementParserEngine

* Rename SQLStatementParserEngine

* For code format

* Move ShardingSphereSQLParserEngine to infra

* Add DistSQLParserFactory

* Fix checkstyle

* Update java doc

* Remove useless ShardingSphereVisitor.getter

* Rename RDLVisitor

* Rename RDL to DistSQL

* Rename RDL module name

* Rename RDL package name

* Rename RDL class name

* Split SQLVisitorFactory

* Add SQLStatementParserEngine

* Rename SQLParserEngine

* Rename ShardingSphereSQLStatementParserEngine

* Refactor SQLParserEngine

* Refactor SQLParsedResultCache

* Add StandardSQLStatementParserEngineFactory

* Refactor StandardSQLStatementParserEngine

* Remove useless SQLParsedResultCache

* For code format

* Rename to getVisitorFacadeFactoryClass() in SQLParserConfiguration

* Refactor StandardSQLParserEngine and cacheEngine

* modify SQLParserEngine

* check style

* java doc

* Remove ShardingSphereSQLParserEngineFactory

* Remove ShardingSphereSQLParserEngineFactory

* Remove ShardingSphereSQLParserEngine from SchemaContextsBuilder

* Remove ShardingSphereSQLParserEngine from SchemaContexts

* Delete DALStatement.interp

* Delete DALStatement.tokens

* Delete DALStatementLexer.tokens

* Delete DALStatementLexer.interp

* Delete DALStatementVisitor.java

* Delete DALStatementParser.java

* Delete DALStatementListener.java

* Delete DALStatementLexer.java

* Delete DALStatementBaseVisitor.java

* Delete DALStatementBaseListener.java

* Add SchemaContexts.getExecutorKernel()

* Use SchemaContexts.getExecutorKernel()

* Remove RuntimeContext.executorKernel

* Remove RuntimeContext.executorKernel

* Add SchemaContexts.getSQLParserEngine

* Use SchemaContexts.getSQLParserEngine

* Remove RuntimeContext.sqlParserEngine

* Remove RuntimeContext

* Refactor MySQLComStmtPrepareExecutor

* Refactor SchemaContexts

* Remove SchemaContext

* Refactor SchemaContextsBuilder

* For checkstyle

* Remove redundant suppression

* For checkstyle

* For checkstyle

* For checkstyle

* For checkstyle

* For checkstyle

* For checkstyle

* For checkstyle

* Add final for classes which not design for extension

* Rename return value to result

* Rename exception variable name

* Code format for PostgreSQLErrPacketFactory

* Refactor PostgreSQLErrPacketFactory

* Refactor PostgreSQLErrPacketFactory

* Rename ConnectionStateHandler to ConnectionStatusHandler

* Rename ConnectionStatusHandler.changeRunningStatusIfNecessary

* Remove ConnectionStatusHandler.getStatus

* Rename statusHandler

* Rename resourceLock.doAwait()

* Refactor BackendConnection

* Merge ConnectionStatus.INIT and TERMINATED to READY

* Refactor MySQLComStmtExecuteExecutor

* Refactor MySQLComStmtExecuteExecutor

* Use protocol framework to process internal COM_QUERY exception

* Use protocol framework to process internal COM_QUERY exception

* Refactor PostgreSQLComBindExecutor

* Refactor PostgreSQLComQueryExecutor

* Remove ErrorResponse

* Revise PostgreSQLCommandExecuteEngine

* Rename ProxySchemaContexts.getAllSchemaNames

* Rename ProxyContext

* Update javadoc

* Update javadoc

* Add generic of MySQLProtocolFrontendEngine

* Add generic of DatabasePacketCodecEngine

* Move proxy.frontend.command package

* Move shardingsphere-kernel-context to shardingsphere-infra-context

* Refactor GovernanceTransactionContexts

* Fix PostgreSQL authentication NPE

* Add PostgreSQL unit test cases

* Add PostgreSQL unit test cases

* Update import

* Support unspecified parameter data type (#6579)

* Support unspecified parameter data type (#6579)

* Support PostgreSQL unspecified parameter data type

* Support unspecified parameter data type, follow review suggestion

* Add exception for unsupported SQL, incomplete rules and other exceptions.

* check style

* Decouple AuthenticationEngine and BackendConnection

* Decouple AuthenticationEngine and BackendConnection

* Refactor BackendResponse judge sequence of MySQLComQueryPacketExecutor

* Refactor BackendResponse judge sequence of MySQLComStmtExecuteExecutor

* Refactor BackendResponse judge sequence of PostgreSQLComBindExecutor

* Refactor BackendResponse judge sequence of PostgreSQLComQueryExecutor

* Refactor MySQLComQueryPacketExecutor

* Refactor MySQLComStmtExecuteExecutor

* Refactor PostgreSQLComBindExecutor

* Refactor PostgreSQLComQueryExecutor

* Decouple AuthenticationEngine and BackendConnection

* Decouple AuthenticationEngine and BackendConnection

* Unify userName to username

* Refactor CommandExecutorTask

* Refactor MySQLComQueryPacketExecutor.isQueryResponse

* Refactor MySQLComStmtExecuteExecutor.isQueryResponse

* Refactor PostgreSQLComBindExecutor.isQueryResponse

* Refactor PostgreSQLComQueryExecutor.isQueryResponse

* Decouple AuthenticationEngine and BackendConnection

* Decouple AuthenticationEngine and BackendConnection

* Refactor MySQLAuthenticationEngine

* Refactor CommandExecutorTask

* Refactor MySQLAuthenticationEngine

* Add AuthenticationResult to refactor AuthenticationEngine