// is this BaseColumn a primary or partitioning key and is val a single
// value or a constant that can be safely coerced to BaseColumn's type?
NABoolean BaseColumn::isKeyColumnValue(ItemExpr& val) const
{
NAColumn *baseCol = getNAColumn();
return
(baseCol != NULL &&
(baseCol->isPrimaryKey() || baseCol->isPartitioningKey()) &&
canSafelyCoerce(val));
}
// this method sets the primary key columns. It goes through all the columns
// of the table, and collects the columns which are marked as primary keys
void TableDesc::setPrimaryKeyColumns()
{
ValueIdSet primaryColumns;
for ( CollIndex j = 0 ; j < colList_.entries() ; j++ )
{
ValueId valId = colList_[j];
NAColumn *column = valId.getNAColumn();
if ( column->isPrimaryKey() )
{
primaryColumns.insert(valId) ;
// mark column as referenced for histogram, as we may need its histogram
// during plan generation
if ((column->isUserColumn() || column->isSaltColumn() ) &&
(column->getNATable()->getSpecialType() == ExtendedQualName::NORMAL_TABLE) )
column->setReferencedForMultiIntHist();
}
}
primaryKeyColumns_ = primaryColumns;
}
