fix: cleanup unused methods (#1635)

src/main/java/com/google/cloud/spanner/jdbc/AbstractJdbcPreparedStatement.java

@@ -170,6 +170,7 @@ public void setAsciiStream(int parameterIndex, InputStream value, int length)
     parameters.setParameter(parameterIndex, value, Types.VARCHAR, length);
   }
 
+  @SuppressWarnings("DeprecatedIsStillUsed")
   @Override
   @Deprecated
   public void setUnicodeStream(int parameterIndex, InputStream value, int length)

src/main/java/com/google/cloud/spanner/jdbc/AbstractJdbcStatement.java

@@ -243,19 +243,6 @@ private <T> T doWithStatementTimeout(
     }
   }
 
-  /**
-   * Executes a SQL statement on the connection of this {@link Statement} as an update (DML)
-   * statement.
-   *
-   * @param statement The SQL statement to execute
-   * @return the number of rows that was inserted/updated/deleted
-   * @throws SQLException if a database error occurs, or if the number of rows affected is larger
-   *     than {@link Integer#MAX_VALUE}
-   */
-  int executeUpdate(com.google.cloud.spanner.Statement statement) throws SQLException {
-    return checkedCast(executeLargeUpdate(statement));
-  }
-
   /**
    * Do a checked cast from long to int. Throws a {@link SQLException} with code {@link
    * Code#OUT_OF_RANGE} if the update count is too big to fit in an int.
@@ -268,18 +255,6 @@ int checkedCast(long updateCount) throws SQLException {
     return (int) updateCount;
   }
 
-  /**
-   * Executes a SQL statement on the connection of this {@link Statement} as an update (DML)
-   * statement.
-   *
-   * @param statement The SQL statement to execute
-   * @return the number of rows that was inserted/updated/deleted
-   * @throws SQLException if a database error occurs
-   */
-  long executeLargeUpdate(com.google.cloud.spanner.Statement statement) throws SQLException {
-    return doWithStatementTimeout(() -> connection.getSpannerConnection().executeUpdate(statement));
-  }
-
   /**
    * Executes a SQL statement on the connection of this {@link Statement}. The SQL statement can be
    * any supported SQL statement, including client side statements such as SET AUTOCOMMIT ON|OFF.