//===----------------------------------------------------------------------===//
// Here, we discover the layout of every column that will be accessed. A
// column's layout includes three pieces of information:
//
// 1. The starting memory address (where the first value of the column is)
// 2. The stride length
// 3. Whether the column is in columnar layout
//===----------------------------------------------------------------------===//
std::vector<TileGroup::ColumnLayout> TileGroup::GetColumnLayouts(
CodeGen &codegen, llvm::Value *tile_group_ptr,
llvm::Value *column_layout_infos) const {
// Call RuntimeFunctions::GetTileGroupLayout()
uint32_t num_cols = schema_.GetColumnCount();
codegen.Call(
RuntimeFunctionsProxy::GetTileGroupLayout,
{tile_group_ptr, column_layout_infos, codegen.Const32(num_cols)});
// Collect <start, stride, is_columnar> triplets of all columns
std::vector<TileGroup::ColumnLayout> layouts;
auto *layout_type = ColumnLayoutInfoProxy::GetType(codegen);
for (uint32_t col_id = 0; col_id < num_cols; col_id++) {
auto *start = codegen->CreateLoad(codegen->CreateConstInBoundsGEP2_32(
layout_type, column_layout_infos, col_id, 0));
auto *stride = codegen->CreateLoad(codegen->CreateConstInBoundsGEP2_32(
layout_type, column_layout_infos, col_id, 1));
auto *columnar = codegen->CreateLoad(codegen->CreateConstInBoundsGEP2_32(
layout_type, column_layout_infos, col_id, 2));
layouts.push_back(ColumnLayout{col_id, start, stride, columnar});
}
return layouts;
}
codegen::Value Sorter::SorterAccess::LoadRowValue(
CodeGen &codegen, Sorter::SorterAccess::Row &row,
uint32_t column_index) const {
if (row.row_pos_ == nullptr) {
auto *addr = codegen->CreateInBoundsGEP(codegen.CharPtrType(), start_pos_,
row.row_idx_);
row.row_pos_ = codegen->CreateLoad(addr);
}
const auto &storage_format = sorter_.GetStorageFormat();
UpdateableStorage::NullBitmap null_bitmap(codegen, storage_format,
row.row_pos_);
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};
}
// Pull out the 'start_pos_' instance member from the provided Sorter instance
llvm::Value *Sorter::GetStartPosition(CodeGen &codegen,
llvm::Value *sorter_ptr) const {
auto *sorter_type = SorterProxy::GetType(codegen);
return codegen->CreateLoad(
codegen->CreateConstInBoundsGEP2_32(sorter_type, sorter_ptr, 0, 0));
}
llvm::Value *Sorter::GetNumberOfStoredTuples(CodeGen &codegen,
llvm::Value *sorter_ptr) const {
auto *sorter_type = SorterProxy::GetType(codegen);
return codegen->CreateLoad(
codegen->CreateConstInBoundsGEP2_32(sorter_type, sorter_ptr, 0, 3));
}
