export declare const _zetasql_ExpressionAttributeProto_ExpressionKind: {
    readonly DEFAULT: 0;
    readonly GENERATED: 1;
};
export type _zetasql_ExpressionAttributeProto_ExpressionKind = 'DEFAULT' | 0 | 'GENERATED' | 1;
export type _zetasql_ExpressionAttributeProto_ExpressionKind__Output = typeof _zetasql_ExpressionAttributeProto_ExpressionKind[keyof typeof _zetasql_ExpressionAttributeProto_ExpressionKind];
export interface ExpressionAttributeProto {
    'expressionString'?: (string);
    'expressionKind'?: (_zetasql_ExpressionAttributeProto_ExpressionKind);
}
export interface ExpressionAttributeProto__Output {
    'expressionString': (string);
    'expressionKind': (_zetasql_ExpressionAttributeProto_ExpressionKind__Output);
}