import type { ColumnDefinition, DictionaryDefinition, MaterializedViewDefinition, ProjectionDefinition, SchemaDefinition, SkipIndexDefinition, TableDefinition } from './model.js';
export declare function renderKeyClauseColumns(columns: string[], columnNames: ReadonlySet<string>): string;
/**
 * Renders ALTER TABLE ... MODIFY REFRESH for a refresh-only change.
 * Per live validation: APPEND must be re-included if present, because ClickHouse
 * treats omitting APPEND as "remove APPEND" and rejects.
 */
export declare function renderAlterModifyRefresh(def: MaterializedViewDefinition): string;
export declare function renderDictionarySQL(def: DictionaryDefinition, replace?: boolean): string;
export declare function toCreateSQL(def: SchemaDefinition): string;
export declare function renderAlterAddColumn(def: TableDefinition, column: ColumnDefinition): string;
export declare function renderAlterModifyColumn(def: TableDefinition, column: ColumnDefinition): string;
/**
 * MODIFY COLUMN without an expression keeps the old one, so dropping it needs an
 * explicit REMOVE. It must run before the MODIFY: in one statement ClickHouse
 * casts the retained default to the new type first, so `'abc'` -> UInt64 fails.
 */
export declare function renderAlterRemoveColumnExpression(def: TableDefinition, column: ColumnDefinition, previous: ColumnDefinition): string | undefined;
export declare function renderAlterDropColumn(def: TableDefinition, columnName: string): string;
export declare function renderAlterRemoveCodec(def: TableDefinition, columnName: string): string;
export declare function renderAlterAddIndex(def: TableDefinition, index: SkipIndexDefinition): string;
export declare function renderAlterDropIndex(def: TableDefinition, indexName: string): string;
export declare function renderAlterAddProjection(def: TableDefinition, projection: ProjectionDefinition): string;
export declare function renderAlterDropProjection(def: TableDefinition, projectionName: string): string;
export declare function renderAlterModifySetting(def: TableDefinition, key: string, value: string | number | boolean): string;
export declare function renderAlterResetSetting(def: TableDefinition, key: string): string;
export declare function renderAlterModifyTTL(def: TableDefinition, ttl: string | undefined): string;
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