* feat: UDAF implementation backed by DataFusion.
Directly Transplant DataFusion's UDAF related structs, traits and functions, like `AggregateUDF`, `Accumulator` or `create_udaf` etc.
Implement median UDAF on top of it and used in unit testing.
Refs: #61
* feat: UDAF made generically
Refs: #61
* fix: cargo fmt
* fix: use prelude
* fix: uniform the name
* fix: move maybe commonly used functions together
* fix: make comments more clear
* fix: resolve conversations in CR
* fix: store input types in AccumulatorCreator, and use ScalarVector's iterator
* feat: introducing List value and List datatype
* refactor: use ArcSwap instead of Mutext
* refactor: shorten some namings
* refactor: move median UDAF out of tests
* refactor: rename
* feat: aggregate function registry
* fix: make `Value` satisfy ordering again
* fix: clippy warnings
* doc: add "how to write aggregate function"
* fix: address PR comments
* fix: trying to get rid of unwraps
Co-authored-by: luofucong <luofucong@greptime.com>
* move interp from test to numpy
* move interp from test to numpy
* move interp from test to numpy
* move interp from test to numpy
* move interp from test to numpy
* Impl TableEngine, bridge to storage
* Impl sql handler to process insert sql
* fix: minor changes and typo
* test: add datanode test
* test: add table-engine test
* fix: code style
* refactor: split out insert mod from sql and minor changes by CR
* refactor: replace with_context with context
* chore(store-api): Fix typo in region comments
* feat(storage): Init storage crate
* feat(store-api): Make some method async
* feat(storage): Blank StorageEngine implementation
* feat(storage): StorageEngine returns owned SchemaRef
* feat: pub use arrow in datatypes
* feat(store-api): Implement RegionMetadata
* feat(storage): Impl create region in memory.
* chore(object-store): Format cargo toml
* chore(storage): Log on region created
* feat: Impl CowCell
* feat: Store id to cf meta mapping
* refactor: Refactor version and rename it to VersionControl
* feat: Impl write batch for put, refactor column family
* feat(storage): Skeleton of writing to memtable
* refactor(storage): MemTable returns MemTableSchema
* feat: Add ColumnSchema and conversion between schema and arrow's schema
* feat: Validate put data
* feat: Valid schema of write batch
* feat: insert memtable WIP
* feat: Impl Inserter for memtable
* feat(datatypes): Implement Eq/Ord for Value
feat: Implement Ord/Eq for Bytes/StringBytes and Deref for Bytes
test: Test Value::from()
* feat: Define BTreeMemTable
* Fix: Rename get/get_unchecked to try_get/get and fix get not consider null.
* feat: Impl BTreeMemTable::write()
* refactor: Remove useless ColumnFamilyHandle now
* chore: Clean comment
* feat(common): Add from `String/&str/Vec<u8>/&[u8]` for Value
* test(storage): Add tests for WriteBatch
* chore: Fix clippy
* feat: Add builder for RowKey/ColumnFamilyDescriptor
* test: Add test for metadata
* chore: Fix clippy
* test: Add test for region and engine
* chore: Fix clippy
* chore: Address CR comment
* feat: adds scalars mod and enhance vectors
* temp commit
* fix compile error
* Impl pow function with new udf framework
* Adds common-function crate and impl scalars function
* fix: remove used code
* test: adds test for function crate and refactor vectors
* fix: fmt style
* feat: impl numpy.clip function
* feat: improve clip function returning int64 type when arguments do not have float type
* feat: adds more test for vectors
* feat: adds replicate method test for primitive vector
* fix: by code review
* feat: clip function returns uint64 when all arguments type are unsigned
* refactor: improve vectors#only_null
* fix: clippy warning
* fix: clippy warning
* fix: clip should return float64 when arguments have both signed and unsigned types
* feat: adds common-telemetry crate and logging mod
* refactor: common telemetry
* feat: adds metric mod and exports metrics by http
* feat: adds metrics to query engine and datanodes
* refactor: rename metrics
* refactor: rename ElapsedTimer struct and elapsed_timer macro
* refactor: log error when fail to new data node.
* fix: use backtrace crate instead of unstable feature
* feat: add must_use attr to Timer
* fix: only reserve Debug attribute for Timer
