/**
 * Shared extended-statistics SQL generation.
 *
 * Mirrors `index-sql.ts`: centralizing the CREATE/DROP builders guarantees the
 * live auto-migrate path (`DbSchemaManager`) and the file scaffold
 * (`MigrationScaffold`) emit identical statements for
 * `CREATE STATISTICS` objects (PostgreSQL extended statistics — expression
 * statistics and multivariate ndistinct/dependencies/mcv).
 *
 * Reconciliation is by NAME only (create when missing): unlike indexes,
 * PostgreSQL has no `pg_get_statisticsobjdef`-style canonical single-string
 * deparser stable enough to diff against the model, and statistics objects are
 * cheap metadata — renaming the object is the supported way to change one.
 */
/** PostgreSQL multivariate statistics kinds. */
export type StatisticsKind = 'ndistinct' | 'dependencies' | 'mcv';
/** Minimal statistics shape needed to render SQL. */
export interface StatisticsSqlSpec {
    name: string;
    /**
     * Raw SQL entries of the `ON` list, in declaration order — quoted column
     * references (`"flags"`) and/or expressions (`("flags" & 1::smallint)`).
     * PostgreSQL requires expressions to be parenthesized; the model layer is
     * responsible for providing them in that form.
     */
    expressions: string[];
    /**
     * Optional multivariate kinds. Omit for PostgreSQL's default (all kinds for
     * multi-entry lists; a SINGLE expression entry must omit kinds — PostgreSQL
     * builds univariate expression statistics for it and rejects a kinds list).
     */
    kinds?: StatisticsKind[];
}
/**
 * Build a `CREATE STATISTICS` statement. `qualifiedTable` must already be
 * quoted / schema-qualified by the caller (e.g. `"public"."t"`). The
 * statistics object itself is created with an unqualified name — PostgreSQL
 * places it in the schema of the current search_path, and the schema manager
 * resolves existence through `pg_statistic_ext` joined to the TABLE's
 * namespace, so lookups stay consistent either way.
 */
export declare function buildCreateStatisticsStatement(spec: StatisticsSqlSpec, qualifiedTable: string, opts?: {
    ifNotExists?: boolean;
}): string;
/**
 * Build a `DROP STATISTICS` statement. `qualifiedName` must already be quoted
 * (and schema-qualified when the object lives outside the search_path).
 */
export declare function buildDropStatisticsStatement(qualifiedName: string, opts?: {
    ifExists?: boolean;
}): string;
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