fix(odc): enable PG-family queryTableOrViewData for GaussDB / openGauss

server/odc-migrate/src/main/resources/migrate/common/R_2_0_0__initialize_version_diff_config.sql

@@ -275,4 +275,15 @@ insert into `odc_version_diff_config`(`config_key`,`db_mode`,`config_value`,`min
 'bit:NUMERIC, tinyint:NUMERIC, smallint:NUMERIC, int:NUMERIC, bigint:NUMERIC, decimal:NUMERIC, numeric:NUMERIC, float:NUMERIC, real:NUMERIC, money:NUMERIC, smallmoney:NUMERIC, char:TEXT, varchar:TEXT, nchar:TEXT, nvarchar:TEXT, text:OBJECT, ntext:OBJECT, binary:TEXT, varbinary:TEXT, image:OBJECT, date:DATE, time:TIME, datetime:DATETIME, datetime2:DATETIME, smalldatetime:DATETIME, datetimeoffset:TIMESTAMP, timestamp:OBJECT, uniqueidentifier:OBJECT, xml:OBJECT, sql_variant:OBJECT, hierarchyid:OBJECT, geography:OBJECT, geometry:OBJECT', '0', CURRENT_TIMESTAMP) ON DUPLICATE KEY update `config_key`=`config_key`;
 insert into `odc_version_diff_config`(`config_key`,`db_mode`,`config_value`,`min_version`,`gmt_create`) values('support_view','SQL_SERVER','true','0',CURRENT_TIMESTAMP) ON DUPLICATE KEY update `config_key`=`config_key`;
 insert into `odc_version_diff_config`(`config_key`,`db_mode`,`config_value`,`min_version`,`gmt_create`) values('support_procedure','SQL_SERVER','true','0',CURRENT_TIMESTAMP) ON DUPLICATE KEY update `config_key`=`config_key`;
-insert into `odc_version_diff_config`(`config_key`,`db_mode`,`config_value`,`min_version`,`gmt_create`) values('support_function','SQL_SERVER','true','0',CURRENT_TIMESTAMP) ON DUPLICATE KEY update `config_key`=`config_key`;
+insert into `odc_version_diff_config`(`config_key`,`db_mode`,`config_value`,`min_version`,`gmt_create`) values('support_function','SQL_SERVER','true','0',CURRENT_TIMESTAMP) ON DUPLICATE KEY update `config_key`=`config_key`;
+
+-- GaussDB / openGauss column data types (PostgreSQL-compatible)
+-- Required so VersionDiffConfigService.getDatatypeList() returns a non-empty list for GAUSSDB sessions.
+-- Without this row, session.dataTypes is empty and the column editor's data type dropdown shows no options.
+insert into `odc_version_diff_config`(`config_key`,`db_mode`,`config_value`,`min_version`,`gmt_create`) values(
+  'column_data_type',
+  'GAUSSDB',
+  'smallint:NUMERIC, integer:NUMERIC, int:NUMERIC, bigint:NUMERIC, decimal:NUMERIC, numeric:NUMERIC, real:NUMERIC, float:NUMERIC, serial:NUMERIC, bigserial:NUMERIC, char:TEXT, varchar:TEXT, text:OBJECT, bytea:OBJECT, boolean:NUMERIC, date:DATE, time:TIME, timestamp:TIMESTAMP, timestamptz:TIMESTAMP, interval:TEXT, json:OBJECT, jsonb:OBJECT, uuid:OBJECT',
+  '1.0',
+  CURRENT_TIMESTAMP
+) ON DUPLICATE KEY UPDATE `config_key`=`config_key`;

server/odc-service/src/main/java/com/oceanbase/odc/service/session/ConnectConsoleService.java

@@ -184,6 +184,18 @@ public SqlExecuteResult queryTableOrViewData(@NotNull String sessionId,
             asyncExecuteReq.setContinueExecutionOnError(true);
             asyncExecuteReq.setFullLinkTraceEnabled(false);
             return executeQueryTableOrViewData(sessionId, connectionSession, asyncExecuteReq);
+        } else if (dialectType.isPgFamily()) {
+            // GaussDB / openGauss / PostgreSQL use PostgreSQL wire protocol, where identifiers
+            // are quoted with double quotes (e.g. "schema"."table"), NOT MySQL back-ticks.
+            // Reusing MySQLSqlBuilder here previously produced
+            // SELECT t.* FROM `schema`.`table` t LIMIT 1000
+            // which triggered SQLState=42601 syntax error at or near "`" against openGauss.
+            // OracleSqlBuilder.identifier() wraps identifiers with '"' (see
+            // StringUtils.ORACLE_IDENTIFIER_WRAP_CHAR), which is exactly what PG expects.
+            // Only identifier() / schemaPrefixIfNotBlank() are exercised below, so the rest of
+            // OracleSqlBuilder's Oracle-specific behavior (value quoting, default values,
+            // LIKE ESCAPE) is never invoked here and is therefore safe to reuse.
+            sqlBuilder = new OracleSqlBuilder();
         } else {
             throw new IllegalArgumentException("Unsupported dialect type, " + dialectType);
         }