v0.7.99-nightly

What's Changed

Build/Testing/CI

• fix flaky test (#6159) by @TCeason

Documentation

• Doc: add databend cloud (#6179) by @bohutang
• website: Add public as static (#6177) by @Xuanwo
• Improvement: limit push down for table fuse_snapshot & proc system$fuse_snapshot (#6167) by @dantengsky
• Doc: AT timestamp (#6154) by @soyeric128

Features

• feat(query): support exists statement. (#6166) by @youngsofun
• feat(planner): support non-equi conditions in hash join (#6145) by @xudong963

Improvement

• Improvement: limit push down for table fuse_snapshot & proc system$fuse_snapshot (#6167) by @dantengsky
• improve: replace downcast_ref with try_into, related to DataType (#6153) by @PsiACE
• chore(log level): downgrade log level to DEBUG of TableVersionMismatched messages (#6162) by @dantengsky
• Improvement(query): fix datatype different cause mysql session distroy (#6150) by @TCeason