query-builder/src/main/java/com/datastax/oss/driver/internal/querybuilder/delete/DefaultDelete.java [164:206]:
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    CqlHelper.append(relations, builder, " WHERE ", " AND ", null);

    if (ifExists) {
      builder.append(" IF EXISTS");
    } else {
      CqlHelper.append(conditions, builder, " IF ", " AND ", null);
    }
    return builder.toString();
  }

  @NonNull
  @Override
  public SimpleStatement build() {
    return builder().build();
  }

  @NonNull
  @Override
  public SimpleStatement build(@NonNull Object... values) {
    return builder().addPositionalValues(values).build();
  }

  @NonNull
  @Override
  public SimpleStatement build(@NonNull Map<String, Object> namedValues) {
    SimpleStatementBuilder builder = builder();
    for (Map.Entry<String, Object> entry : namedValues.entrySet()) {
      builder.addNamedValue(entry.getKey(), entry.getValue());
    }
    return builder.build();
  }

  @NonNull
  @Override
  public SimpleStatementBuilder builder() {
    return SimpleStatement.builder(asCql()).setIdempotence(isIdempotent());
  }

  public boolean isIdempotent() {
    // Conditional queries are never idempotent, see JAVA-819
    if (!conditions.isEmpty() || ifExists) {
      return false;
    } else {
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query-builder/src/main/java/com/datastax/oss/driver/internal/querybuilder/update/DefaultUpdate.java [206:248]:
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    CqlHelper.append(relations, builder, " WHERE ", " AND ", null);

    if (ifExists) {
      builder.append(" IF EXISTS");
    } else {
      CqlHelper.append(conditions, builder, " IF ", " AND ", null);
    }
    return builder.toString();
  }

  @NonNull
  @Override
  public SimpleStatement build() {
    return builder().build();
  }

  @NonNull
  @Override
  public SimpleStatement build(@NonNull Object... values) {
    return builder().addPositionalValues(values).build();
  }

  @NonNull
  @Override
  public SimpleStatement build(@NonNull Map<String, Object> namedValues) {
    SimpleStatementBuilder builder = builder();
    for (Map.Entry<String, Object> entry : namedValues.entrySet()) {
      builder.addNamedValue(entry.getKey(), entry.getValue());
    }
    return builder.build();
  }

  @NonNull
  @Override
  public SimpleStatementBuilder builder() {
    return SimpleStatement.builder(asCql()).setIdempotence(isIdempotent());
  }

  public boolean isIdempotent() {
    // Conditional queries are never idempotent, see JAVA-819
    if (!conditions.isEmpty() || ifExists) {
      return false;
    } else {
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