feiweihy commented on a change in pull request #6366:
URL: https://github.com/apache/shardingsphere/pull/6366#discussion_r457047745



##########
File path: 
shardingsphere-sql-parser/shardingsphere-sql-parser-binder/src/main/java/org/apache/shardingsphere/sql/parser/binder/metadata/util/JdbcUtil.java
##########
@@ -36,7 +37,12 @@ public static String getSchema(final Connection connection, 
final String databas
         String result = null;
         try {
             if ("Oracle".equals(databaseType)) {
-                return null;
+                DatabaseMetaData metaData = connection.getMetaData();
+                if (null != metaData) {
+                    return metaData.getUserName() == null ? null : 
metaData.getUserName().toUpperCase();

Review comment:
       > Hi @feiweihy
   > 
   > I know that. Generally, we need a unit test to verify the changes from 
anyone. Here another our committer gave the same conclusion, which made me 
believe it very well may be correct. Thanks for your response.
   > I looked at Travis and triggered it again. However, the result shows,
   > 
   > ```
   > [INFO] -------------------------------------------------------
   > 1119[INFO]  T E S T S
   > 1120[INFO] -------------------------------------------------------
   > 1121[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.metadata.column.ColumnMetaDataLoaderTest
   > 1122[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 
3.917 s - in 
org.apache.shardingsphere.sql.parser.binder.metadata.column.ColumnMetaDataLoaderTest
   > 1123[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.metadata.index.IndexMetaDataLoaderTest
   > 1124[ERROR] Tests run: 2, Failures: 0, Errors: 1, Skipped: 0, Time 
elapsed: 0.024 s <<< FAILURE! - in 
org.apache.shardingsphere.sql.parser.binder.metadata.index.IndexMetaDataLoaderTest
   > 1125[ERROR] 
assertOracleLoad(org.apache.shardingsphere.sql.parser.binder.metadata.index.IndexMetaDataLoaderTest)
  Time elapsed: 0.012 s  <<< ERROR!
   > 1126java.lang.NullPointerException
   > 1127       at 
org.apache.shardingsphere.sql.parser.binder.metadata.index.IndexMetaDataLoaderTest.assertOracleLoad(IndexMetaDataLoaderTest.java:71)
   > 1128
   > 1129[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.metadata.MetaDataConnectionTest
   > 1130[INFO] Tests run: 4, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 
0.02 s - in 
org.apache.shardingsphere.sql.parser.binder.metadata.MetaDataConnectionTest
   > 1131[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.metadata.util.JdbcUtilTest
   > 1132[ERROR] Tests run: 2, Failures: 0, Errors: 1, Skipped: 0, Time 
elapsed: 0.008 s <<< FAILURE! - in 
org.apache.shardingsphere.sql.parser.binder.metadata.util.JdbcUtilTest
   > 1133[ERROR] 
assertOracleGetSchema(org.apache.shardingsphere.sql.parser.binder.metadata.util.JdbcUtilTest)
  Time elapsed: 0.001 s  <<< ERROR!
   > 1134java.lang.NullPointerException
   > 1135       at 
org.apache.shardingsphere.sql.parser.binder.metadata.util.JdbcUtilTest.assertOracleGetSchema(JdbcUtilTest.java:47)
   > 1136
   > 1137[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.metadata.table.SchemaMetaDataTest
   > 1138[INFO] Tests run: 9, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 
0.239 s - in 
org.apache.shardingsphere.sql.parser.binder.metadata.table.SchemaMetaDataTest
   > 1139[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.metadata.table.TableMetaDataLoaderTest
   > 1140[INFO] Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 
0.176 s - in 
org.apache.shardingsphere.sql.parser.binder.metadata.table.TableMetaDataLoaderTest
   > 1141[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.metadata.table.TableMetaDataTest
   > 1142[INFO] Tests run: 3, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 
0.002 s - in 
org.apache.shardingsphere.sql.parser.binder.metadata.table.TableMetaDataTest
   > 1143[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.segment.select.pagination.engine.LimitPaginationContextEngineTest
   > 1144[INFO] Tests run: 3, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 
0.061 s - in 
org.apache.shardingsphere.sql.parser.binder.segment.select.pagination.engine.LimitPaginationContextEngineTest
   > 1145[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.segment.select.pagination.engine.RowNumberPaginationContextEngineTest
   > 1146[INFO] Tests run: 8, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 
0.094 s - in 
org.apache.shardingsphere.sql.parser.binder.segment.select.pagination.engine.RowNumberPaginationContextEngineTest
   > 1147[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.segment.select.pagination.engine.TopPaginationContextEngineTest
   > 1148[INFO] Tests run: 5, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 
0.019 s - in 
org.apache.shardingsphere.sql.parser.binder.segment.select.pagination.engine.TopPaginationContextEngineTest
   > 1149[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.segment.select.pagination.engine.PaginationContextEngineTest
   > 1150[INFO] Tests run: 4, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 
0.013 s - in 
org.apache.shardingsphere.sql.parser.binder.segment.select.pagination.engine.PaginationContextEngineTest
   > 1151[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.segment.select.pagination.PaginationContextTest
   > 1152[INFO] Tests run: 13, Failures: 0, Errors: 0, Skipped: 0, Time 
elapsed: 0.06 s - in 
org.apache.shardingsphere.sql.parser.binder.segment.select.pagination.PaginationContextTest
   > 1153[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.segment.select.orderby.engine.OrderByContextEngineTest
   > 1154[INFO] Tests run: 3, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 
0.01 s - in 
org.apache.shardingsphere.sql.parser.binder.segment.select.orderby.engine.OrderByContextEngineTest
   > 1155[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.segment.select.orderby.OrderByItemTest
   > 1156[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 
0.145 s - in 
org.apache.shardingsphere.sql.parser.binder.segment.select.orderby.OrderByItemTest
   > 1157[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.segment.select.groupby.engine.GroupByContextEngineTest
   > 1158[INFO] Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 
0.003 s - in 
org.apache.shardingsphere.sql.parser.binder.segment.select.groupby.engine.GroupByContextEngineTest
   > 1159[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.segment.select.projection.ProjectionsContextTest
   > 1160[INFO] Tests run: 11, Failures: 0, Errors: 0, Skipped: 0, Time 
elapsed: 0.015 s - in 
org.apache.shardingsphere.sql.parser.binder.segment.select.projection.ProjectionsContextTest
   > 1161[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.segment.select.projection.DerivedColumnTest
   > 1162[INFO] Tests run: 5, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 
0.004 s - in 
org.apache.shardingsphere.sql.parser.binder.segment.select.projection.DerivedColumnTest
   > 1163[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.segment.select.projection.engine.ProjectionsContextEngineTest
   > 1164[INFO] Tests run: 7, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 
0.046 s - in 
org.apache.shardingsphere.sql.parser.binder.segment.select.projection.engine.ProjectionsContextEngineTest
   > 1165[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.segment.select.projection.engine.ProjectionEngineTest
   > 1166[INFO] Tests run: 8, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 
0.099 s - in 
org.apache.shardingsphere.sql.parser.binder.segment.select.projection.engine.ProjectionEngineTest
   > 1167[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.segment.select.projection.impl.ShorthandProjectionTest
   > 1168[INFO] Tests run: 4, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 
0.01 s - in 
org.apache.shardingsphere.sql.parser.binder.segment.select.projection.impl.ShorthandProjectionTest
   > 1169[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.segment.select.projection.impl.AggregationDistinctProjectionTest
   > 1170[INFO] Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 
0.004 s - in 
org.apache.shardingsphere.sql.parser.binder.segment.select.projection.impl.AggregationDistinctProjectionTest
   > 1171[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.segment.insert.values.InsertValueContextTest
   > 1172[INFO] Tests run: 3, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 
0.008 s - in 
org.apache.shardingsphere.sql.parser.binder.segment.insert.values.InsertValueContextTest
   > 1173[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.segment.insert.values.expression.DerivedParameterMarkerExpressionSegmentTest
   > 1174[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 
0.002 s - in 
org.apache.shardingsphere.sql.parser.binder.segment.insert.values.expression.DerivedParameterMarkerExpressionSegmentTest
   > 1175[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.segment.insert.values.expression.DerivedLiteralExpressionSegmentTest
   > 1176[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 
0.003 s - in 
org.apache.shardingsphere.sql.parser.binder.segment.insert.values.expression.DerivedLiteralExpressionSegmentTest
   > 1177[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.segment.insert.values.OnDuplicateUpdateContextTest
   > 1178[INFO] Tests run: 5, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 
0.015 s - in 
org.apache.shardingsphere.sql.parser.binder.segment.insert.values.OnDuplicateUpdateContextTest
   > 1179[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.segment.insert.keygen.engine.GeneratedKeyContextEngineTest
   > 1180[INFO] Tests run: 3, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 
0.016 s - in 
org.apache.shardingsphere.sql.parser.binder.segment.insert.keygen.engine.GeneratedKeyContextEngineTest
   > 1181[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContextTest
   > 1182[INFO] Tests run: 6, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 
0.018 s - in 
org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContextTest
   > 1183[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.statement.SQLStatementContextFactoryTest
   > 1184[INFO] Tests run: 3, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 
0.122 s - in 
org.apache.shardingsphere.sql.parser.binder.statement.SQLStatementContextFactoryTest
   > 1185[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.statement.impl.InsertStatementContextTest
   > 1186[INFO] Tests run: 4, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 
0.014 s - in 
org.apache.shardingsphere.sql.parser.binder.statement.impl.InsertStatementContextTest
   > 1187[INFO] Running 
org.apache.shardingsphere.sql.parser.binder.statement.impl.SelectStatementContextTest
   > 1188[INFO] Tests run: 8, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 
0.008 s - in 
org.apache.shardingsphere.sql.parser.binder.statement.impl.SelectStatementContextTest
   > 1189[INFO] 
   > 1190[INFO] Results:
   > 1191[INFO] 
   > 1192[ERROR] Errors: 
   > 1193[ERROR]   IndexMetaDataLoaderTest.assertOracleLoad:71 » NullPointer
   > 1194[ERROR]   JdbcUtilTest.assertOracleGetSchema:47 » NullPointer
   > 1195[INFO] 
   > 1196[ERROR] Tests run: 133, Failures: 0, Errors: 2, Skipped: 0
   > 1197[INFO] 
   > 1198[INFO] 
   > 1199[INFO] 
------------------------------------------------------------------------
   > 1200[INFO] Skipping shardingsphere
   > 1201[INFO] This project has been banned from the build due to previous 
failures.
   > 1202[INFO] 
------------------------------------------------------------------------
   > 1203[INFO] 
------------------------------------------------------------------------
   > 1204[INFO] Reactor Summary for shardingsphere 5.0.0-RC1-SNAPSHOT:
   > 1205[INFO] 
   > 1206[INFO] shardingsphere ..................................... SUCCESS [  
6.580 s]
   > 1207[INFO] shardingsphere-sql-parser .......................... SUCCESS [  
0.849 s]
   > 1208[INFO] shardingsphere-sql-parser-spi ...................... SUCCESS [  
3.980 s]
   > 1209[INFO] shardingsphere-sql-parser-statement ................ SUCCESS [ 
14.323 s]
   > 1210[INFO] shardingsphere-sql-parser-engine ................... SUCCESS [  
7.343 s]
   > 1211[INFO] shardingsphere-sql-parser-binder ................... FAILURE [ 
10.002 s]
   > 1212[INFO] shardingsphere-sql-parser-dialect .................. SKIPPED
   > 1213[INFO] shardingsphere-sql-parser-sql92 .................... SKIPPED
   > 1214[INFO] shardingsphere-sql-parser-mysql .................... SKIPPED
   > 1215[INFO] shardingsphere-sql-parser-postgresql ............... SKIPPED
   > 1216[INFO] shardingsphere-sql-parser-oracle ................... SKIPPED
   > 1217[INFO] shardingsphere-sql-parser-sqlserver ................ SKIPPED
   > 1218[INFO] shardingsphere-sql-parser-test ..................... SKIPPED
   > 1219[INFO] shardingsphere-db-protocol ......................... SKIPPED
   > 1220[INFO] shardingsphere-db-protocol-core .................... SKIPPED
   > 1221[INFO] shardingsphere-db-protocol-mysql ................... SKIPPED
   > 1222[INFO] shardingsphere-db-protocol-postgresql .............. SKIPPED
   > 1223[INFO] shardingsphere-infra ............................... SKIPPED
   > 1224[INFO] shardingsphere-infra-common ........................ SKIPPED
   > 1225[INFO] shardingsphere-infra-route ......................... SKIPPED
   > 1226[INFO] shardingsphere-infra-rewrite ....................... SKIPPED
   > 1227[INFO] shardingsphere-infra-rewrite-engine ................ SKIPPED
   > 1228[INFO] shardingsphere-infra-rewrite-test .................. SKIPPED
   > 1229[INFO] shardingsphere-infra-executor ...................... SKIPPED
   > 1230[INFO] shardingsphere-infra-merge ......................... SKIPPED
   > 1231[INFO] shardingsphere-transaction ......................... SKIPPED
   > 1232[INFO] shardingsphere-transaction-core .................... SKIPPED
   > 1233[INFO] shardingsphere-kernel .............................. SKIPPED
   > 1234[INFO] shardingsphere-kernel-context ...................... SKIPPED
   > 1235[INFO] shardingsphere-features ............................ SKIPPED
   > 1236[INFO] shardingsphere-sharding ............................ SKIPPED
   > 1237[INFO] shardingsphere-sharding-api ........................ SKIPPED
   > 1238[INFO] shardingsphere-sharding-common ..................... SKIPPED
   > 1239[INFO] shardingsphere-sharding-route ...................... SKIPPED
   > 1240[INFO] shardingsphere-master-slave ........................ SKIPPED
   > 1241[INFO] shardingsphere-master-slave-api .................... SKIPPED
   > 1242[INFO] shardingsphere-master-slave-common ................. SKIPPED
   > 1243[INFO] shardingsphere-master-slave-route .................. SKIPPED
   > 1244[INFO] shardingsphere-encrypt ............................. SKIPPED
   > 1245[INFO] shardingsphere-encrypt-api ......................... SKIPPED
   > 1246[INFO] shardingsphere-encrypt-common ...................... SKIPPED
   > 1247[INFO] shardingsphere-encrypt-rewrite ..................... SKIPPED
   > 1248[INFO] shardingsphere-sharding-rewrite .................... SKIPPED
   > 1249[INFO] shardingsphere-shadow .............................. SKIPPED
   > 1250[INFO] shardingsphere-shadow-api .......................... SKIPPED
   > 1251[INFO] shardingsphere-shadow-common ....................... SKIPPED
   > 1252[INFO] shardingsphere-shadow-rewrite ...................... SKIPPED
   > 1253[INFO] shardingsphere-shadow-route ........................ SKIPPED
   > 1254[INFO] shardingsphere-sharding-merge ...................... SKIPPED
   > 1255[INFO] shardingsphere-encrypt-merge ....................... SKIPPED
   > 1256[INFO] shardingsphere-replica ............................. SKIPPED
   > 1257[INFO] shardingsphere-replica-api ......................... SKIPPED
   > 1258[INFO] shardingsphere-replica-common ...................... SKIPPED
   > 1259[INFO] shardingsphere-replica-route ....................... SKIPPED
   > 1260[INFO] shardingsphere-replica-execute ..................... SKIPPED
   > 1261[INFO] shardingsphere-jdbc ................................ SKIPPED
   > 1262[INFO] shardingsphere-jdbc-core ........................... SKIPPED
   > 1263[INFO] shardingsphere-control-panel ....................... SKIPPED
   > 1264[INFO] shardingsphere-control-panel-spi ................... SKIPPED
   > 1265[INFO] shardingsphere-metrics ............................. SKIPPED
   > 1266[INFO] shardingsphere-metrics-configuration ............... SKIPPED
   > 1267[INFO] shardingsphere-cluster ............................. SKIPPED
   > 1268[INFO] shardingsphere-cluster-configuration ............... SKIPPED
   > 1269[INFO] shardingsphere-orchestration ....................... SKIPPED
   > 1270[INFO] shardingsphere-orchestration-core .................. SKIPPED
   > 1271[INFO] shardingsphere-orchestration-core-configuration .... SKIPPED
   > 1272[INFO] shardingsphere-orchestration-center ................ SKIPPED
   > 1273[INFO] shardingsphere-orchestration-center-api ............ SKIPPED
   > 1274[INFO] shardingsphere-orchestration-core-common ........... SKIPPED
   > 1275[INFO] shardingsphere-orchestration-core-configcenter ..... SKIPPED
   > 1276[INFO] shardingsphere-orchestration-core-registrycenter ... SKIPPED
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   > 1280[INFO] shardingsphere-cluster-heartbeat ................... SKIPPED
   > 1281[INFO] shardingsphere-cluster-state ....................... SKIPPED
   > 1282[INFO] shardingsphere-cluster-facade ...................... SKIPPED
   > 1283[INFO] shardingsphere-jdbc-orchestration .................. SKIPPED
   > 1284[INFO] shardingsphere-jdbc-spring ......................... SKIPPED
   > 1285[INFO] shardingsphere-jdbc-spring-infra ................... SKIPPED
   > 1286[INFO] shardingsphere-jdbc-spring-boot-starter-infra ...... SKIPPED
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   > 1289[INFO] shardingsphere-sharding-spring-boot-starter ........ SKIPPED
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   > 1337[INFO] shardingsphere-transaction-base-seata-at ........... SKIPPED
   > 1338[INFO] shardingsphere-control-panel-core .................. SKIPPED
   > 1339[INFO] shardingsphere-orchestration-center-etcd ........... SKIPPED
   > 1340[INFO] shardingsphere-orchestration-center-apollo ......... SKIPPED
   > 1341[INFO] shardingsphere-orchestration-center-nacos .......... SKIPPED
   > 1342[INFO] shardingsphere-integration-test .................... SKIPPED
   > 1343[INFO] shardingsphere-test-fixture ........................ SKIPPED
   > 1344[INFO] shardingsphere-proxy-docker-build .................. SKIPPED
   > 1345[INFO] shardingsphere-test-suite .......................... SKIPPED
   > 1346[INFO] shardingsphere-distribution ........................ SKIPPED
   > 1347[INFO] shardingsphere-src-distribution .................... SKIPPED
   > 1348[INFO] shardingsphere-jdbc-distribution ................... SKIPPED
   > 1349[INFO] shardingsphere-proxy-distribution .................. SKIPPED
   > 1350[INFO] shardingsphere-scaling-distribution ................ SKIPPED
   > 1351[INFO] 
------------------------------------------------------------------------
   > 1352[INFO] BUILD FAILURE
   > 1353[INFO] 
------------------------------------------------------------------------
   > 1354[INFO] Total time:  45.093 s
   > 1355[INFO] Finished at: 2020-07-19T01:51:23Z
   > 1356[INFO] 
------------------------------------------------------------------------
   > 1357[ERROR] Failed to execute goal 
org.apache.maven.plugins:maven-surefire-plugin:2.22.0:test (default-test) on 
project shardingsphere-sql-parser-binder: There are test failures.
   > ```
   > 
   > Trista
   
   I have edited codes according to @yu199195 upstairs
   Meantime I provide  unit test SchemaMetaDataLoaderTest
   In this unit test, it just run in an non-real database environment. For real 
database, I will run it in our test environment.




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