fix(phoenix): preserve schema in all table references

crates/dbx-core/src/sql_dialect/table_select.rs

@@ -385,6 +385,10 @@ pub(crate) fn uses_connection_identifier_quote(
     identifier_quote: Option<&str>,
 ) -> bool {
     database_type == Some(DatabaseType::Kingbase)
+        // JDBC table-data requests carry the schema returned by DatabaseMetaData.
+        // Keep the JDBC identifier unquoted when no driver quote was reported, but
+        // still qualify the table with that schema.
+        || database_type == Some(DatabaseType::Jdbc)
         // Spanner is dual-dialect: GoogleSQL uses backticks, the PostgreSQL dialect uses
         // double quotes, and only the connected agent knows which. Unconditional like
         // Kingbase — when no quote was reported the callers fall back to

crates/dbx-core/src/sql_dialect/tests.rs

@@ -378,6 +378,44 @@ fn jdbc_non_tdengine_and_unscoped_tdengine_previews_remain_unqualified() {
     }
 }
 
+#[test]
+fn jdbc_table_data_qualifies_schema_without_forcing_identifier_quotes() {
+    assert_eq!(
+        build_table_data_select_sql(TableDataSelectSqlOptions {
+            database_type: Some(DatabaseType::Jdbc),
+            driver_profile: Some("phoenix".to_string()),
+            schema: Some("DEMO".to_string()),
+            table_name: "STUDENT".to_string(),
+            limit: Some(100),
+            ..Default::default()
+        }),
+        "SELECT * FROM DEMO.STUDENT;"
+    );
+    assert_eq!(
+        build_table_data_select_sql(TableDataSelectSqlOptions {
+            database_type: Some(DatabaseType::Jdbc),
+            driver_profile: Some("phoenix".to_string()),
+            identifier_quote: Some("\"".to_string()),
+            schema: Some("MY_SCHEMA".to_string()),
+            table_name: "ORDER".to_string(),
+            limit: Some(100),
+            ..Default::default()
+        }),
+        "SELECT * FROM \"MY_SCHEMA\".\"ORDER\";"
+    );
+    assert_eq!(
+        build_table_data_select_sql(TableDataSelectSqlOptions {
+            database_type: Some(DatabaseType::Jdbc),
+            driver_profile: Some("phoenix".to_string()),
+            schema: None,
+            table_name: "STUDENT".to_string(),
+            limit: Some(100),
+            ..Default::default()
+        }),
+        "SELECT * FROM STUDENT;"
+    );
+}
+
 #[test]
 fn builds_table_data_where_and_schema_queries() {
     assert_eq!(