* 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

* 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

* 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

* For code inspection

* For code inspection

* For code inspection

* Fix checkstyle

* Add gitignore and optimize proxy backend interface.

* remove gen

* Refactor OrderedSPIRegistry

* Make field as local if possible

* Add @SuppressWarnings("unchecked")

* Remove redundant throws

* Remove assertEquals

* Add genertic type

* Support PostgreSQL array type (#6408)

* Support PostgreSQL array type, unit test (#6408)

* Support PostgreSQL array type, follow review suggestion (#6408)

* add DefaultRawSQLExecutorCallback

* remove useless callback

* add RawProxyExecutor

* refactor ShardingSphereStatement & ShardingSpherePreparedStatement

* add QueryHeaderBuilder

* merge QueryHeader and ExecuteQueryHeader

* merge ExecuteResponse and ExecuteResult

* rename ExecuteResponse to ExecuteResult

* rename ExecuteResponse to ExecuteResult

* refactor org.apache.shardingsphere.infra.executor.sql.raw.execute.result

* remove DefaultRawSQLExecutorCallback

* refactor UpdateResponse

* Rename AbstractShardingJDBCDatabaseAndTableTest to AbstractShardingSphereDataSourceForShardingTest

* Rename AbstractShadowJDBCDatabaseAndTableTest to AbstractShardingSphereDataSourceForShadowTest

* Rename AbstractMasterSlaveJDBCTest to AbstractShardingSphereDataSourceForMasterSlaveTest

* Rename AbstractEncryptJDBCDatabaseAndTableTest to AbstractShardingSphereDataSourceForEncryptTest

* Rename ShardingProxyContext to ShardingSphereProxyContext

* Rename sharding-proxy to shardingsphere-proxy

* rename org.apache.shardingsphere.shardingproxy to org.apache.shardingsphere.proxy

* rename shardingsphere-database-protocol to shardingsphere-db-protocol

* rename package org.apache.shardingsphere.database to org.apache.shardingsphere.db

* fix compile error

* rename variable name from logicSchema to schema

* #3555, fix postgresql proxy return redundant command complete packet

* #3555, for comments

* move sharding-proxy-transport to shardingsphere-database-protocol

* rename sharding-proxy-transport to shardingsphere-database-protocol for maven module

* rename org.apache.shardingsphere.shardingproxy.transport to org.apache.shardingsphere.database.protocol

* upgrade java version from 7 to 8

* upgrade lambda expr for java8

* use java8 Optional instead of guava Optional

* use java8 Optional instead of guava Optional