Merge pull request databendlabs#3288 from Veeupup/string-improvement

[string performence improvement]

Merge pull request databendlabs#3282 from sundy-li/nulls

Default expression support

Merge pull request databendlabs#3271 from sundy-li/merging-elt

Merging elt databendlabs#3199

Merge pull request databendlabs#3241 from mshauneu/substring_index

SUBSTRING_INDEX() func

Merge pull request databendlabs#3234 from SGZW/issue-2978

ISSUE databendlabs#2978, Add system.query_log

Merge pull request databendlabs#3226 from dantengsky/fix-3222

ISSUE-3222: refactoring insert interpreter

Merge pull request databendlabs#3211 from BohuTANG/dev-interpreter-re…

…fine

Refactor: Move plan schedulers to plan_schedulers dir

Merge pull request databendlabs#3154 from ygf11/fix-3128

[ISSUE-3128] Support Projection push down for MemoryTable Engine

Merge pull request databendlabs#3150 from Veeupup/ISSUE-3144-replace-…

…stmt

[fuse table] insert overwrite stmt implementation

Merge pull request databendlabs#3146 from datafuselabs/dependabot/car…

…go/main/syn-1.0.82

Bump syn from 1.0.81 to 1.0.82