public Builder content(String file) {
            final String fileName = ClickHouseChecker.nonEmpty(file, "File");
            this.content = ClickHouseDeferredValue.of(() -> {
                try {
                    return ClickHouseUtils.getFileInputStream(fileName);
                } catch (FileNotFoundException e) {
                    throw new IllegalArgumentException(e.getMessage());
                }
            });
            return this;
        }
Sets deferred content.

@param content non-null deferred content
@return this builder
clickhouse-data/src/main/java/com/clickhouse/data/ClickHouseExternalTable.java