public void putIfAbsent(String modelName,
                            String valueCName,
                            Column.ValueDataType dataType,
                            int defaultValue,
                            int scopeId,
                            boolean multiIntValues) {
        mapping.putIfAbsent(modelName, new ValueColumn(valueCName, dataType, defaultValue, scopeId, multiIntValues));
    }
Register the new metadata for the given model name.
oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/storage/annotation/ValueColumnMetadata.java