WHERE data @ '{"name": "some product"}';
Samsung and SK Hynix have now both dropped by around 20% respectively since U.S. strikes began.，更多细节参见新收录的资料
“They keep going on the news and saying they’re doing everything they can to get Americans out,” Ramos said after landing in Miami on Thursday. “I know for a fact they’re not.”。新收录的资料是该领域的重要参考
Lightweight updates take a fundamentally different approach. Instead of rewriting entire data parts, a lightweight update creates a small, compact "patch part" containing only the changed column values and metadata to locate the affected rows. These patches are applied on-the-fly during reads (so changes are visible immediately) and materialized efficiently during regular background merges — piggybacking on work ClickHouse is already doing. This can be up to 1,000× faster than classic mutations for many workloads. The same mechanism can be used for deletes, which set a _row_exists = 0 mask via a patch part rather than rewriting columns. For a deep dive into how patch parts work, see our series on fast UPDATEs in ClickHouse: Part 1 — purpose-built engines and Part 2 — SQL-style updates.。关于这个话题，PDF资料提供了深入分析