entity-derive-impl 0.20.17

Internal proc-macro implementation for entity-derive. Use entity-derive instead.
Documentation 
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// SPDX-FileCopyrightText: 2025-2026 RAprogramm <andrey.rozanov.vl@gmail.com>
// SPDX-License-Identifier: MIT

//! `ClickHouse` implementation for repository code generation.
//!
//! # Status
//!
//! Not yet implemented. Use `sql = "trait"` and implement manually.
//!
//! # Planned Features
//!
//! - Columnar storage optimizations
//! - Batch insert support
//! - `MergeTree` engine configuration
//! - Async insert mode

use proc_macro2::TokenStream;
use quote::quote;

use crate::entity::parse::EntityDef;

/// Generate `ClickHouse` repository implementation.
///
/// Currently generates a compile error directing users to implement manually.
pub fn generate(_entity: &EntityDef) -> TokenStream {
    quote! {
        compile_error!(
            "ClickHouse support is not implemented; see \
             https://github.com/RAprogramm/entity-derive/issues/23. \
             Use `sql = \"trait\"` to generate only the trait, \
             then implement it for `clickhouse::Client`."
        );
    }
}