fix(sql): keep merge update set line in statement continuation

apps/desktop/src/lib/__tests__/sql/sqlStatementRanges.spec.ts

@@ -1472,6 +1472,45 @@ FROM orders;`;
     }
   });
 
+  it("keeps an Oracle MERGE together when each action starts its own line (#9516)", () => {
+    const merge = `MERGE INTO bom_template t USING (SELECT id, no FROM stage_bom) s ON (t.id = s.id)
+WHEN MATCHED THEN
+UPDATE SET
+  t.no = s.no
+WHERE
+  t.no IS NULL
+WHEN NOT MATCHED THEN
+INSERT (id, no)
+VALUES (s.id, s.no)`;
+    for (const needle of ["MERGE INTO", "UPDATE SET", "WHERE", "INSERT (id, no)", "VALUES (s.id, s.no)"]) {
+      expect(statementRangeAtCursor(merge, indexOf(merge, needle), "oracle")?.sql.trim()).toBe(merge);
+    }
+    expect(rangeSqlTexts(executableStatementRanges(merge, "oracle"))).toEqual([merge]);
+  });
+
+  it("keeps an Oracle MERGE delete action that starts its own line together", () => {
+    const merge = `MERGE INTO bom_template t USING (SELECT id FROM stage_bom) s ON (t.id = s.id)
+WHEN MATCHED THEN
+DELETE WHERE t.no IS NULL`;
+    expect(rangeSqlTexts(executableStatementRanges(merge, "oracle"))).toEqual([merge]);
+  });
+
+  it("keeps an Oracle MERGE together when the UPDATE action's SET starts its own line", () => {
+    const merge = `MERGE INTO bom_template t USING (SELECT id, no FROM stage_bom) s ON (t.id = s.id)
+WHEN MATCHED THEN
+UPDATE
+SET t.no = s.no`;
+    const update = "UPDATE bom_template\nSET no = 'x'";
+    expect(rangeSqlTexts(executableStatementRanges(merge, "oracle"))).toEqual([merge]);
+    expect(rangeSqlTexts(executableStatementRanges(`${merge};\n\n${update};`, "oracle"))).toEqual([merge, update]);
+  });
+
+  it("still splits a standalone UPDATE that follows a terminated MERGE", () => {
+    const merge = "MERGE INTO bom_template t USING (SELECT id FROM stage_bom) s ON (t.id = s.id)\nWHEN MATCHED THEN UPDATE SET t.no = s.no";
+    const update = "UPDATE bom_template SET no = 'x'";
+    expect(rangeSqlTexts(executableStatementRanges(`${merge};\n\n${update};`, "oracle"))).toEqual([merge, update]);
+  });
+
   it("returns the full SAP HANA DO block for cursors inside nested statements", () => {
     const range = statementRangeAtCursor(sapHanaDoBlockFixture, indexOf(sapHanaDoBlockFixture, "Result"), "saphana");
 

apps/desktop/src/lib/sql/sqlStatementRanges.ts

@@ -1106,8 +1106,13 @@ function isMysqlAlterTableTruncatePartitionContinuation(sql: string, statementFr
 }
 
 function isMergeActionContinuation(sql: string, statementFrom: number, lineStartFrom: number, keyword: string, databaseType?: DatabaseType, parameterOptions?: SqlParameterOptions): boolean {
-  if (keyword !== "INSERT" || !startsWithSqlWords(sql, statementFrom, ["MERGE"], databaseType, parameterOptions)) return false;
+  // Oracle (and friends) allow each MERGE action on its own line after
+  // `WHEN ... MATCHED THEN`, e.g. `UPDATE SET ...` (#9516); only INSERT was
+  // recognized, so UPDATE/DELETE action lines split the statement in two.
+  if (keyword !== "INSERT" && keyword !== "UPDATE" && keyword !== "DELETE" && keyword !== "SET") return false;
+  if (!startsWithSqlWords(sql, statementFrom, ["MERGE"], databaseType, parameterOptions)) return false;
   const words = topLevelWordsBefore(sql, statementFrom, lineStartFrom, 5, databaseType, parameterOptions);
+  if (keyword === "SET") return words[words.length - 1] === "UPDATE" && words.includes("THEN") && words.includes("MATCHED");
   return words[words.length - 1] === "THEN" && words.includes("WHEN") && words.includes("MATCHED");
 }