wrapper/src/main/java/software/amazon/jdbc/dialect/PgDialect.java [72:100]:
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  public boolean isDialect(final Connection connection) {
    Statement stmt = null;
    ResultSet rs = null;
    try {
      stmt = connection.createStatement();
      rs = stmt.executeQuery("SELECT 1 FROM pg_proc LIMIT 1");
      if (rs.next()) {
        return true;
      }
    } catch (final SQLException ex) {
      // ignore
    } finally {
      if (stmt != null) {
        try {
          stmt.close();
        } catch (SQLException ex) {
          // ignore
        }
      }
      if (rs != null) {
        try {
          rs.close();
        } catch (SQLException ex) {
          // ignore
        }
      }
    }
    return false;
  }
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wrapper/src/main/java/software/amazon/jdbc/dialect/AuroraMysqlDialect.java [46:75]:
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  public boolean isDialect(final Connection connection) {
    Statement stmt = null;
    ResultSet rs = null;
    try {
      stmt = connection.createStatement();
      rs = stmt.executeQuery("SHOW VARIABLES LIKE 'aurora_version'");
      if (rs.next()) {
        // If variable with such name is presented then it means it's an Aurora cluster
        return true;
      }
    } catch (final SQLException ex) {
      // ignore
    } finally {
      if (stmt != null) {
        try {
          stmt.close();
        } catch (SQLException ex) {
          // ignore
        }
      }
      if (rs != null) {
        try {
          rs.close();
        } catch (SQLException ex) {
          // ignore
        }
      }
    }
    return false;
  }
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