import type { Sampling, AtomicTypeDef, TimeDeltaExpr, RegexMatchExpr, MeasureTimeExpr, BasicAtomicTypeDef, RecordLiteralNode, OrderBy } from '../../model/malloy_types';
import type { DialectFunctionOverloadDef } from '../functions';
import type { DialectFieldList, FieldReferenceType } from '../dialect';
import { PostgresBase } from '../pg_impl';
export declare class DuckDBDialect extends PostgresBase {
    name: string;
    experimental: boolean;
    defaultNumberType: string;
    defaultDecimalType: string;
    hasFinalStage: boolean;
    divisionIsInteger: boolean;
    supportsSumDistinctFunction: boolean;
    unnestWithNumbers: boolean;
    defaultSampling: {
        rows: number;
    };
    supportUnnestArrayAgg: boolean;
    supportsAggDistinct: boolean;
    supportsCTEinCoorelatedSubQueries: boolean;
    dontUnionIndex: boolean;
    supportsQualify: boolean;
    supportsSafeCast: boolean;
    supportsNesting: boolean;
    supportsCountApprox: boolean;
    get udfPrefix(): string;
    quoteTablePath(tableName: string): string;
    sqlGroupSetTable(groupSetCount: number): string;
    sqlAnyValue(groupSet: number, fieldName: string): string;
    sqlLiteralNumber(literal: string): string;
    mapFields(fieldList: DialectFieldList): string;
    sqlAggregateTurtle(groupSet: number, fieldList: DialectFieldList, orderBy: string | undefined): string;
    sqlAnyValueTurtle(groupSet: number, fieldList: DialectFieldList): string;
    sqlAnyValueLastTurtle(name: string, groupSet: number, sqlName: string): string;
    sqlCoaleseMeasuresInline(groupSet: number, fieldList: DialectFieldList): string;
    sqlUnnestAlias(source: string, alias: string, _fieldList: DialectFieldList, needDistinctKey: boolean, _isArray: boolean, isInNestedPipeline: boolean): string;
    sqlSumDistinctHashedKey(_sqlDistinctKey: string): string;
    sqlGenerateUUID(): string;
    sqlDateToString(sqlDateExp: string): string;
    sqlFieldReference(parentAlias: string, parentType: FieldReferenceType, childName: string, _childType: string): string;
    sqlUnnestPipelineHead(isSingleton: boolean, sourceSQLExpression: string): string;
    sqlCreateFunction(id: string, funcText: string): string;
    sqlCreateFunctionCombineLastStage(lastStageName: string, dialectFieldList: DialectFieldList, orderBy: OrderBy[] | undefined): string;
    sqlSelectAliasAsStruct(alias: string, dialectFieldList: DialectFieldList): string;
    sqlCreateTableAsSelect(_tableName: string, _sql: string): string;
    sqlSumDistinct(key: string, value: string, funcName: string): string;
    sqlAggDistinct(key: string, values: string[], func: (valNames: string[]) => string): string;
    sqlSampleTable(tableSQL: string, sample: Sampling | undefined): string;
    sqlOrderBy(orderTerms: string[]): string;
    sqlLiteralString(literal: string): string;
    sqlLiteralRegexp(literal: string): string;
    getDialectFunctionOverrides(): {
        [name: string]: DialectFunctionOverloadDef[];
    };
    getDialectFunctions(): {
        [name: string]: DialectFunctionOverloadDef[];
    };
    malloyTypeToSQLType(malloyType: AtomicTypeDef): string;
    parseDuckDBType(sqlType: string): AtomicTypeDef;
    sqlTypeToMalloyType(sqlType: string): BasicAtomicTypeDef;
    castToString(expression: string): string;
    concat(...values: string[]): string;
    validateTypeName(sqlType: string): boolean;
    sqlAlterTimeExpr(df: TimeDeltaExpr): string;
    sqlRegexpMatch(df: RegexMatchExpr): string;
    sqlMeasureTimeExpr(df: MeasureTimeExpr): string;
    sqlLiteralRecord(lit: RecordLiteralNode): string;
}