Column = ref object
  idx*: int
  name*: string
  kind*: DuckType

DuckType {.pure.} = enum
  Invalid = 0, Boolean = 1, TinyInt = 2, SmallInt = 3, Integer = 4, BigInt = 5,
  UTinyInt = 6, USmallInt = 7, UInteger = 8, UBigInt = 9, Float = 10,
  Double = 11, Timestamp = 12, Date = 13, Time = 14, Interval = 15,
  HugeInt = 16, Varchar = 17, Blob = 18, Decimal = 19, TimestampS = 20,
  TimestampMs = 21, TimestampNs = 22, Enum = 23, List = 24, Struct = 25,
  Map = 26, UUID = 27, Union = 28, Bit = 29, TimeTz = 30, TimestampTz = 31,
  UHugeInt = 32, Array = 33, Any = 34, VarInt = 35, SqlNull = 36

LogicalType = object
  handle*: duckdb_logical_type

PendingQueryResult = distinct ptr duckdb_pending_result

QueryResult = object of duckdb_result

Statement = distinct ptr duckdb_prepared_statement

Timestamp {.borrow: `.`.} = distinct DateTime

ValidityMask = object
  handle*: ptr UncheckedArray[uint64]
  size*: int

Value = ref object of ValueBase

Vector = ref object
  mask*: seq[uint64] = []
  case kind*: DuckType
  of DuckType.Invalid, DuckType.ANY, DuckType.VARINT, DuckType.SQLNULL:
    valueInvalid*: uint8
  of DuckType.Boolean:
    valueBoolean*: seq[bool]
  of DuckType.TinyInt:
    valueTinyint*: seq[int8]
  of DuckType.SmallInt:
    valueSmallint*: seq[int16]
  of DuckType.Integer:
    valueInteger*: seq[int32]
  of DuckType.BigInt:
    valueBigint*: seq[int64]
  of DuckType.UTinyInt:
    valueUTinyint*: seq[uint8]
  of DuckType.USmallInt:
    valueUSmallint*: seq[uint16]
  of DuckType.UInteger:
    valueUInteger*: seq[uint32]
  of DuckType.UBigInt:
    valueUBigint*: seq[uint64]
  of DuckType.Float:
    valueFloat*: seq[float32]
  of DuckType.Double:
    valueDouble*: seq[float64]
  of DuckType.Timestamp:
    valueTimestamp*: seq[Timestamp]
  of DuckType.Date:
    valueDate*: seq[DateTime]
  of DuckType.Time:
    valueTime*: seq[Time]
  of DuckType.Interval:
    valueInterval*: seq[TimeInterval]
  of DuckType.HugeInt:
    valueHugeint*: seq[Int128]
  of DuckType.Varchar:
    valueVarchar*: seq[string]
  of DuckType.Blob:
    valueBlob*: seq[seq[byte]]
  of DuckType.Decimal:
    valueDecimal*: seq[DecimalType]
  of DuckType.TimestampS:
    valueTimestampS*: seq[DateTime]
  of DuckType.TimestampMs:
    valueTimestampMs*: seq[DateTime]
  of DuckType.TimestampNs:
    valueTimestampNs*: seq[DateTime]
  of DuckType.Enum:
    valueEnum*: seq[uint]
  of DuckType.List, DuckType.Array:
    valueList*: seq[seq[Value]]
  of DuckType.Struct:
    valueStruct*: seq[Table[string, Value]]
  of DuckType.Map:
    valueMap*: seq[Table[string, Value]]
  of DuckType.UUID:
    valueUUID*: seq[Uuid]
  of DuckType.Union:
    valueUnion*: seq[Table[string, Value]]
  of DuckType.Bit:
    valueBit*: seq[string]
  of DuckType.TimeTz:
    valueTimeTz*: seq[ZonedTime]
  of DuckType.TimestampTz:
    valueTimestampTz*: seq[ZonedTime]
  of DuckType.UHugeInt:
    valueUHugeint*: seq[UInt128]

BITS_PER_VALUE = 64

SECONDS_PER_DAY = 86400

STRING_INLINE_LENGTH = 12