feat(fulltext_index): introduce creator

Signed-off-by: Zhenchi <[email protected]>

src/index/Cargo.toml

@@ -24,9 +24,14 @@ pin-project.workspace = true
 prost.workspace = true
 regex.workspace = true
 regex-automata.workspace = true
+serde.workspace = true
 snafu.workspace = true
+tantivy = { version = "0.22", features = ["zstd-compression"] }
+tantivy-jieba = "0.11.0"
+tokio.workspace = true
 
 [dev-dependencies]
+common-test-util.workspace = true
 rand.workspace = true
 tempfile.workspace = true
 tokio.workspace = true

src/index/src/fulltext_index.rs

@@ -0,0 +1,37 @@
+// Copyright 2023 Greptime Team
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use serde::{Deserialize, Serialize};
+
+pub mod create;
+pub mod error;
+
+/// Configuration for fulltext index.
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize, Default)]
+pub struct Config {
+    /// Analyzer to use for tokenization.
+    pub analyzer: Analyzer,
+
+    /// Whether the index should be case sensitive.
+    pub case_sensitive: bool,
+}
+
+/// Analyzer to use for tokenization.
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize, Default)]
+pub enum Analyzer {
+    #[default]
+    English,
+
+    Chinese,
+}

src/index/src/fulltext_index/create.rs

@@ -0,0 +1,33 @@
+// Copyright 2023 Greptime Team
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+mod tantivy;
+
+use async_trait::async_trait;
+pub use tantivy::TantivyFulltextIndexCreator;
+
+use crate::fulltext_index::error::Result;
+
+/// `FulltextIndexCreator` is for creating a fulltext index.`
+#[async_trait]
+pub trait FulltextIndexCreator: Send {
+    /// Pushes a text to the index.
+    async fn push_text(&mut self, text: &str) -> Result<()>;
+
+    /// Finalizes the creation of the index.
+    async fn finish(&mut self) -> Result<()>;
+
+    /// Returns the memory usage in bytes during the creation of the index.
+    fn memory_usage(&self) -> usize;
+}