ThanoshanMV commented on a change in pull request #10253:
URL: https://github.com/apache/shardingsphere/pull/10253#discussion_r627222548
##########
File path:
shardingsphere-sql-parser/shardingsphere-sql-parser-dialect/shardingsphere-sql-parser-oracle/src/main/antlr4/imports/oracle/DDLStatement.g4
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@@ -1421,3 +1421,258 @@ leadCdbUriClause
propertyClause
: PROPERTY (SET | REMOVE) DEFAULT_CREDENTIAL EQ_ qualifiedCredentialName
;
+
+alterSystem
+ : ALTER SYSTEM alterSystemOption
+ ;
+
+alterSystemOption
+ : archiveLogClause
+ | checkpointClause
+ | checkDatafilesClause
+ | distributedRecovClauses
+ | flushClause
+ | endSessionClauses
+ | switchLogfileClause
+ | suspendResumeClause
+ | quiesceClauses
+ | rollingMigrationClauses
+ | rollingPatchClauses
+ | alterSystemSecuriyClauses
+ | affinityClauses
+ | shutdownDispatcherClause
+ | registerClause
+ | setClause
+ | resetClause
+ | relocateClientClause
+ | cancelSqlClause
+ | flushPasswordfileMetadataCacheClause
+ ;
+
+archiveLogClause
+ : ARCHIVE LOG instanceClause? (sequenceClause | changeClause |
currentClause | groupClause | logfileClause | nextClause | allClause)
toLocationClause?
+ ;
+
+checkpointClause
+ : CHECKPOINT (GLOBAL | LOCAL)?
+ ;
+
+checkDatafilesClause
+ : CHECK DATAFILES (GLOBAL | LOCAL)?
+ ;
+
+distributedRecovClauses
+ : (ENABLE | DISABLE) DISTRIBUTED RECOVERY
+ ;
+
+flushClause
+ : FLUSH flushClauseOption
+ ;
+
+endSessionClauses
+ : (disconnectSessionClause | killSessionClause) (IMMEDIATE | NOREPLY)?
+ ;
+
+switchLogfileClause
+ : SWITCH LOGFILE
+ ;
+
+suspendResumeClause
+ : SUSPEND | RESUME
+ ;
+
+quiesceClauses
+ : QUIESCE RESTRICTED | UNQUIESCE
+ ;
+
+rollingMigrationClauses
+ : startRollingMigrationClause | stopRollingMigrationClause
+ ;
+
+rollingPatchClauses
+ : startRollingPatchClause | stopRollingPatchClause
+ ;
+
+alterSystemSecuriyClauses
+ : restrictedSessionClause | setEncryptionWalletOpenClause |
setEncryptionWalletCloseClause | setEncryptionKeyClause
+ ;
+
+affinityClauses
+ : enableAffinityClause | disableAffinityClause
+ ;
+
+shutdownDispatcherClause
+ : SHUTDOWN IMMEDIATE? dispatcherName
+ ;
+
+registerClause
+ : REGISTER
+ ;
+
+setClause
+ : SET alterSystemSetClause+
+ ;
+
+resetClause
+ : RESET alterSystemResetClause+
+ ;
+
+relocateClientClause
+ : RELOCATE CLIENT clientId
+ ;
+
+cancelSqlClause
+ : CANCEL SQL SQ_ sessionId serialNumber instanceId? sqlId? SQ_
+ ;
+
+flushPasswordfileMetadataCacheClause
+ : FLUSH PASSWORDFILE_METADATA_CACHE
+ ;
+
+instanceClause
+ : INSTANCE instanceName
+ ;
+
+sequenceClause
+ : SEQUENCE numberLiterals
Review comment:
In [ALTER
SYSTEM](https://docs.oracle.com/en/database/oracle/oracle-database/19/sqlrf/ALTER-SYSTEM.html#GUID-2C638517-D73A-41CA-9D8E-A62D1A0B7ADB),
`sequenceClause` specifies the **log sequence number** in the specified
thread. Is this log sequence number same with sequence number that we generate
using [CREATE
SEQUENCE](https://docs.oracle.com/en/database/oracle/oracle-database/19/sqlrf/CREATE-SEQUENCE.html#GUID-E9C78A8C-615A-4757-B2A8-5E6EFB130571)
statement?
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