query-builder/src/main/java/com/datastax/dse/driver/internal/querybuilder/schema/DefaultCreateDseFunction.java [109:154]:
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  @NonNull
  @Override
  public String asCql() {
    StringBuilder builder = new StringBuilder();

    builder.append("CREATE ");
    if (orReplace) {
      builder.append("OR REPLACE ");
    }
    builder.append("FUNCTION ");

    if (ifNotExists) {
      builder.append("IF NOT EXISTS ");
    }
    CqlHelper.qualify(keyspace, functionName, builder);

    builder.append(" (");

    boolean first = true;
    for (Map.Entry<CqlIdentifier, DataType> param : parameters.entrySet()) {
      if (first) {
        first = false;
      } else {
        builder.append(',');
      }
      builder
          .append(param.getKey().asCql(true))
          .append(' ')
          .append(param.getValue().asCql(false, true));
    }
    builder.append(')');
    if (returnsNullOnNull) {
      builder.append(" RETURNS NULL");
    } else {
      builder.append(" CALLED");
    }

    builder.append(" ON NULL INPUT");

    if (returnType == null) {
      // return type has not been provided yet.
      return builder.toString();
    }

    builder.append(" RETURNS ");
    builder.append(returnType.asCql(false, true));
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query-builder/src/main/java/com/datastax/oss/driver/internal/querybuilder/schema/DefaultCreateFunction.java [83:128]:
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  @NonNull
  @Override
  public String asCql() {
    StringBuilder builder = new StringBuilder();

    builder.append("CREATE ");
    if (orReplace) {
      builder.append("OR REPLACE ");
    }
    builder.append("FUNCTION ");

    if (ifNotExists) {
      builder.append("IF NOT EXISTS ");
    }
    CqlHelper.qualify(keyspace, functionName, builder);

    builder.append(" (");

    boolean first = true;
    for (Map.Entry<CqlIdentifier, DataType> param : parameters.entrySet()) {
      if (first) {
        first = false;
      } else {
        builder.append(',');
      }
      builder
          .append(param.getKey().asCql(true))
          .append(' ')
          .append(param.getValue().asCql(false, true));
    }
    builder.append(')');
    if (returnsNullOnNull) {
      builder.append(" RETURNS NULL");
    } else {
      builder.append(" CALLED");
    }

    builder.append(" ON NULL INPUT");

    if (returnType == null) {
      // return type has not been provided yet.
      return builder.toString();
    }

    builder.append(" RETURNS ");
    builder.append(returnType.asCql(false, true));
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