| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package arrow |
| |
| // Type is a logical type. They can be expressed as |
| // either a primitive physical type (bytes or bits of some fixed size), a |
| // nested type consisting of other data types, or another data type (e.g. a |
| // timestamp encoded as an int64) |
| type Type int |
| |
| const ( |
| // NULL type having no physical storage |
| NULL Type = iota |
| |
| // BOOL is a 1 bit, LSB bit-packed ordering |
| BOOL |
| |
| // UINT8 is an Unsigned 8-bit little-endian integer |
| UINT8 |
| |
| // INT8 is a Signed 8-bit little-endian integer |
| INT8 |
| |
| // UINT16 is an Unsigned 16-bit little-endian integer |
| UINT16 |
| |
| // INT16 is a Signed 16-bit little-endian integer |
| INT16 |
| |
| // UINT32 is an Unsigned 32-bit little-endian integer |
| UINT32 |
| |
| // INT32 is a Signed 32-bit little-endian integer |
| INT32 |
| |
| // UINT64 is an Unsigned 64-bit little-endian integer |
| UINT64 |
| |
| // INT64 is a Signed 64-bit little-endian integer |
| INT64 |
| |
| // FLOAT16 is a 2-byte floating point value |
| FLOAT16 |
| |
| // FLOAT32 is a 4-byte floating point value |
| FLOAT32 |
| |
| // FLOAT64 is an 8-byte floating point value |
| FLOAT64 |
| |
| // STRING is a UTF8 variable-length string |
| STRING |
| |
| // BINARY is a Variable-length byte type (no guarantee of UTF8-ness) |
| BINARY |
| |
| // FIXED_SIZE_BINARY is a binary where each value occupies the same number of bytes |
| FIXED_SIZE_BINARY |
| |
| // DATE32 is int32 days since the UNIX epoch |
| DATE32 |
| |
| // DATE64 is int64 milliseconds since the UNIX epoch |
| DATE64 |
| |
| // TIMESTAMP is an exact timestamp encoded with int64 since UNIX epoch |
| // Default unit millisecond |
| TIMESTAMP |
| |
| // TIME32 is a signed 32-bit integer, representing either seconds or |
| // milliseconds since midnight |
| TIME32 |
| |
| // TIME64 is a signed 64-bit integer, representing either microseconds or |
| // nanoseconds since midnight |
| TIME64 |
| |
| // INTERVAL is YEAR_MONTH or DAY_TIME interval in SQL style |
| INTERVAL |
| |
| // DECIMAL is a precision- and scale-based decimal type. Storage type depends on the |
| // parameters. |
| DECIMAL |
| |
| // LIST is a list of some logical data type |
| LIST |
| |
| // STRUCT of logical types |
| STRUCT |
| |
| // UNION of logical types |
| UNION |
| |
| // DICTIONARY aka Category type |
| DICTIONARY |
| |
| // MAP is a repeated struct logical type |
| MAP |
| |
| // Custom data type, implemented by user |
| EXTENSION |
| |
| // Fixed size list of some logical type |
| FIXED_SIZE_LIST |
| |
| // Measure of elapsed time in either seconds, milliseconds, microseconds |
| // or nanoseconds. |
| DURATION |
| ) |
| |
| // DataType is the representation of an Arrow type. |
| type DataType interface { |
| ID() Type |
| // Name is name of the data type. |
| Name() string |
| } |
| |
| // FixedWidthDataType is the representation of an Arrow type that |
| // requires a fixed number of bits in memory for each element. |
| type FixedWidthDataType interface { |
| DataType |
| // BitWidth returns the number of bits required to store a single element of this data type in memory. |
| BitWidth() int |
| } |
| |
| type BinaryDataType interface { |
| DataType |
| binary() |
| } |