/**
* 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());
}
