feat: reduce the pain of having to bring various schemas every time write data

[fengjiachun]

In order to improve the compactness and write performance of network data transmission, we require that TableSchema information be filled in every time a write request is called.：

TableSchema schema =
        TableSchema
                .newBuilder(TableName.with("public", "monitor"))
                .semanticTypes(SemanticType.Tag, SemanticType.Timestamp, SemanticType.Field, SemanticType.Field)
                .dataTypes(ColumnDataType.String, ColumnDataType.TimestampMillisecond, ColumnDataType.Float64,
                        ColumnDataType.Float64) //
                .columnNames("host", "ts", "cpu", "memory") //
                .build();

WriteRows rows = WriteRows.newBuilder(schema).build();
rows.insert("127.0.0.1", System.currentTimeMillis(), 0.1, null) //
        .insert("127.0.0.2", System.currentTimeMillis(), 0.3, 0.5) //
        .finish();

CompletableFuture<Result<WriteOk, Err>> future = greptimeDB.write(rows);

However, this has caused inconvenience for users and made the writing process complex and cumbersome. Therefore, we need to find a solution to solve this problem.

My idea is cache TableSchema and provide a method to search for schema by table name:

TableSchema schema = TableSchema.findByName(tableName);
WriteRows rows = WriteRows.newBuilder(schema).build();
rows.insert("127.0.0.1", System.currentTimeMillis(), 0.1, null) //
        .insert("127.0.0.2", System.currentTimeMillis(), 0.3, 0.5) //
        .finish();

This requires that the following insert values must be in the same order as the schema.

Is there a better way?