C++ ArrayDesc::isImmutable方法代码示例

    /**
     * Perform operator-specific checks of input and return the shape of the output. Currently,
     * the output array must exist.
     * @param schemas the shapes of the input arrays
     * @param query the query context
     */
    ArrayDesc inferSchema(std::vector< ArrayDesc> schemas, shared_ptr< Query> query)
    {
        assert(schemas.size() == 1);
        assert(_parameters.size() == 1);

        string arrayName = ((shared_ptr<OperatorParamReference>&)_parameters[0])->getObjectName();
        ArrayDesc const& srcDesc = schemas[0];

        //Ensure attributes names uniqueness.
        ArrayDesc dstDesc;
        if (!SystemCatalog::getInstance()->getArrayDesc(arrayName, dstDesc, false))
        {
            throw USER_EXCEPTION(SCIDB_SE_INFER_SCHEMA, SCIDB_LE_ARRAY_DOESNT_EXIST) << arrayName;
        }

        if(dstDesc.isImmutable())
        {
            throw USER_EXCEPTION(SCIDB_SE_INFER_SCHEMA, SCIDB_LE_ILLEGAL_OPERATION)
                    << "Target of INSERT must be a mutable array";
        }

        Dimensions const& srcDims = srcDesc.getDimensions();
        Dimensions const& dstDims = dstDesc.getDimensions();

        if (srcDims.size() != dstDims.size())
        {
            //TODO: this will get lifted when we allow redimension+insert in the same op
            //and when we DO implement redimension+insert - we will need to match attributes/dimensions by name, not position.
            throw USER_EXCEPTION(SCIDB_SE_INFER_SCHEMA, SCIDB_LE_ILLEGAL_OPERATION)
                    << "Temporary restriction: target of INSERT must have same dimensions as the source";
        }

        for (size_t i = 0, n = srcDims.size(); i < n; i++)
        {
            if( srcDims[i].getType() != TID_INT64 || dstDims[i].getType() != TID_INT64)
            {
                throw USER_EXCEPTION(SCIDB_SE_INFER_SCHEMA, SCIDB_LE_ILLEGAL_OPERATION)
                    << "Temporary restriction: INSERT only supports integer dimensions";
            }

            //TODO: we can also allow arrays that are smaller whose length is not evenly divided by chunk interval
            //but then we have to detect "edge chunks" and rewrite them cleverly
            if( srcDims[i].getStartMin() != dstDims[i].getStartMin() ||
                srcDims[i].getChunkInterval() != dstDims[i].getChunkInterval() ||
                srcDims[i].getChunkOverlap() != dstDims[i].getChunkOverlap() ||
                srcDims[i].getEndMax() > dstDims[i].getEndMax() ||
                ( srcDims[i].getEndMax() < dstDims[i].getEndMax() &&
                  srcDims[i].getLength() % srcDims[i].getChunkInterval() != 0))
            {
                throw USER_EXCEPTION(SCIDB_SE_INFER_SCHEMA, SCIDB_LE_DIMENSIONS_DONT_MATCH)
                        << srcDims[i].getBaseName() << dstDims[i].getBaseName();
            }
        }

        Attributes const& srcAttrs = srcDesc.getAttributes(true);
        Attributes const& dstAttrs = dstDesc.getAttributes(true);

        if (srcAttrs.size() != dstAttrs.size())
        {
            throw USER_EXCEPTION(SCIDB_SE_INFER_SCHEMA, SCIDB_LE_ILLEGAL_OPERATION)
                    << "Temporary restriction: target of INSERT must have same attributes as the source";
        }
        for (size_t i = 0, n = srcAttrs.size(); i < n; i++)
        {
            if(srcAttrs[i].getType() != dstAttrs[i].getType())
            {
                throw USER_EXCEPTION(SCIDB_SE_INFER_SCHEMA, SCIDB_LE_WRONG_ATTRIBUTE_TYPE)
                    << srcAttrs[i].getName() << srcAttrs[i].getType() << dstAttrs[i].getType();
            }

            //can't store nulls into a non-nullable attribute
            if(!dstAttrs[i].isNullable() && srcAttrs[i].isNullable())
            {
                throw USER_EXCEPTION(SCIDB_SE_INFER_SCHEMA, SCIDB_LE_WRONG_ATTRIBUTE_FLAGS)
                   << srcAttrs[i].getName();
            }
        }

        //Note: let us NOT add arrayID numbers to the schema - because we do not have our ArrayID yet.
        //We will get our ArrayID when we execute and create the array. Until then - don't bother.
        //Old store code adds the arrayID to the schema - but that's the arrayID of the previous version,
        //not the new version created by the op. A dangerous fallacy - stupid and unnecessary.
        return ArrayDesc(arrayName, dstDesc.getAttributes(), dstDesc.getDimensions(), dstDesc.getFlags());
    }