codegen::Value Sorter::SorterAccess::LoadRowValue(
CodeGen &codegen, Sorter::SorterAccess::Row &row,
uint32_t column_index) const {
if (row.row_pos_ == nullptr) {
auto *tuple_size = sorter_.GetTupleSize(codegen);
auto *skip = codegen->CreateMul(row.row_idx_, tuple_size);
row.row_pos_ =
codegen->CreateInBoundsGEP(codegen.ByteType(), start_pos_, skip);
}
const auto &storage_format = sorter_.GetStorageFormat();
UpdateableStorage::NullBitmap null_bitmap{codegen, storage_format,
row.row_pos_};
if (!null_bitmap.IsNullable(column_index)) {
return storage_format.GetValueSkipNull(codegen, row.row_pos_, column_index);
} else {
return storage_format.GetValue(codegen, row.row_pos_, column_index,
null_bitmap);
}
}
// Load a given column for the row with the given TID
codegen::Value TileGroup::LoadColumn(
CodeGen &codegen, llvm::Value *tid,
const TileGroup::ColumnLayout &layout) const {
// We're calculating: col[tid] = col_start + (tid * col_stride)
llvm::Value *col_address =
codegen->CreateInBoundsGEP(codegen.ByteType(), layout.col_start_ptr,
codegen->CreateMul(tid, layout.col_stride));
// The value, length and is_null check
llvm::Value *val = nullptr, *length = nullptr, *is_null = nullptr;
// Column metadata
bool is_nullable = schema_.AllowNull(layout.col_id);
const auto &column = schema_.GetColumn(layout.col_id);
const auto &sql_type = type::SqlType::LookupType(column.GetType());
// Check if it's a string or numeric value
if (sql_type.IsVariableLength()) {
auto *varlen_type = VarlenProxy::GetType(codegen);
auto *varlen_ptr_ptr = codegen->CreateBitCast(
col_address, varlen_type->getPointerTo()->getPointerTo());
if (is_nullable) {
codegen::Varlen::GetPtrAndLength(
codegen, codegen->CreateLoad(varlen_ptr_ptr), val, length, is_null);
} else {
codegen::Varlen::SafeGetPtrAndLength(
codegen, codegen->CreateLoad(varlen_ptr_ptr), val, length);
}
PL_ASSERT(val != nullptr && length != nullptr);
} else {
// Get the LLVM type of the column
llvm::Type *col_type = nullptr, *col_len_type = nullptr;
sql_type.GetTypeForMaterialization(codegen, col_type, col_len_type);
PL_ASSERT(col_type != nullptr && col_len_type == nullptr);
// val = *(col_type*)col_address;
val = codegen->CreateLoad(
col_type,
codegen->CreateBitCast(col_address, col_type->getPointerTo()));
if (is_nullable) {
// To check for NULL, we need to perform a comparison between the value we
// just read from the table with the NULL value for the column's type. We
// need to be careful that the runtime type of both values is not NULL to
// bypass the type system's NULL checking logic.
if (sql_type.TypeId() == peloton::type::TypeId::BOOLEAN) {
is_null = type::Boolean::Instance().CheckNull(codegen, col_address);
} else {
auto val_tmp = codegen::Value{sql_type, val};
auto null_val =
codegen::Value{sql_type, sql_type.GetNullValue(codegen).GetValue()};
auto val_is_null = val_tmp.CompareEq(codegen, null_val);
PL_ASSERT(!val_is_null.IsNullable());
is_null = val_is_null.GetValue();
}
}
}
// Names
val->setName(column.GetName());
if (length != nullptr) length->setName(column.GetName() + ".len");
if (is_null != nullptr) is_null->setName(column.GetName() + ".null");
// Return the value
auto type = type::Type{column.GetType(), is_nullable};
return codegen::Value{type, val, length, is_null};
}