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LibSQL: BTree index, Heap, and Meta objects for SQL Storage layer

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Unfortunately this patch is quite large.

The main functionality included are a BTree index implementation and
the Heap class which manages persistent storage.

Also included are a Key subclass of the Tuple class, which is a
specialization for index key tuples. This "dragged in" the Meta layer,
which has classes defining SQL objects like tables and indexes.
This commit is contained in:
Jan de Visser 2021-06-17 13:47:42 -04:00 • committed by Andreas Kling
parent 2a46529170
commit 224804b424
15 changed files with 2153 additions and 0 deletions
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46
Userland/Libraries/LibSQL/Index.cpp Normal file
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/*
* Copyright (c) 2021, Jan de Visser <jan@de-visser.net>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibSQL/Heap.h>
#include <LibSQL/Index.h>
#include <LibSQL/Meta.h>
namespace SQL {
Index::Index(Heap& heap, TupleDescriptor const& descriptor, bool unique, u32 pointer)
: m_heap(heap)
, m_descriptor(descriptor)
, m_unique(unique)
, m_pointer(pointer)
{
}
Index::Index(Heap& heap, TupleDescriptor const& descriptor, u32 pointer)
: m_heap(heap)
, m_descriptor(descriptor)
, m_pointer(pointer)
{
}
ByteBuffer Index::read_block(u32 block)
{
auto ret = m_heap.read_block(block);
if (ret.is_error()) {
warnln("Error reading block {}: {}", block, ret.error());
VERIFY_NOT_REACHED();
}
return ret.value();
}
void Index::add_to_write_ahead_log(IndexNode* node)
{
VERIFY(node->pointer());
ByteBuffer buffer;
node->serialize(buffer);
m_heap.add_to_wal(node->pointer(), buffer);
}
}