Change prepareThreshold to 1 as default

Author: tedyu

jdbc-yugabytedb/src/main/java/org/postgresql/PGProperty.java

@@ -91,7 +91,7 @@ public enum PGProperty {
    * Sets the default threshold for enabling server-side prepare. A value of {@code -1} stands for
    * forceBinary
    */
-  PREPARE_THRESHOLD("prepareThreshold", "5",
+  PREPARE_THRESHOLD("prepareThreshold", "1",
       "Statement prepare threshold. A value of {@code -1} stands for forceBinary"),
 
   /**

jdbc-yugabytedb/src/test/java/org/postgresql/test/jdbc2/PreparedStatementTest.java

@@ -1319,7 +1319,7 @@ public void testStatementDescribe() throws SQLException {
   }
 
   @Test
-  public void testBatchWithPrepareThreshold5() throws SQLException {
+  public void testBatchWithPrepareThreshold1() throws SQLException {
     assumeBinaryModeRegular();
     Assume.assumeTrue("simple protocol only does not support prepared statement requests",
         preferQueryMode != PreferQueryMode.SIMPLE);
@@ -1331,7 +1331,7 @@ public void testBatchWithPrepareThreshold5() throws SQLException {
     // When using a prepareThreshold of 5, a batch update should use server-side prepare
     pstmt = con.prepareStatement("INSERT INTO batch_tab_threshold5 (id, val) VALUES (?,?)");
     ((PgStatement) pstmt).setPrepareThreshold(5);
-    for (int p = 0; p < 5; p++) {
+    for (int p = 0; p < 1; p++) {
       for (int i = 0; i <= 5; i++) {
         pstmt.setLong(1, i);
         pstmt.setLong(2, i);
@@ -1340,9 +1340,9 @@ public void testBatchWithPrepareThreshold5() throws SQLException {
       pstmt.executeBatch();
     }
     pstmt.close();
-    assertTrue("prepareThreshold=5, so the statement should be server-prepared",
+    assertTrue("prepareThreshold=1, so the statement should be server-prepared",
         ((PGStatement) pstmt).isUseServerPrepare());
-    assertEquals("prepareThreshold=5, so the statement should be server-prepared", 1,
+    assertEquals("prepareThreshold=1, so the statement should be server-prepared", 1,
         getNumberOfServerPreparedStatements("INSERT INTO batch_tab_threshold5 (id, val) VALUES ($1,$2)"));
   }