apache-arrow
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Apache Arrow columnar in-memory format
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See the NOTICE file\n// distributed with this work for additional information\n// regarding copyright ownership. The ASF licenses this file\n// to you under the Apache License, Version 2.0 (the\n// \"License\"); you may not use this file except in compliance\n// with the License. You may obtain a copy of the License at\n//\n// http://www.apache.org/licenses/LICENSE-2.0\n//\n// Unless required by applicable law or agreed to in writing,\n// software distributed under the License is distributed on an\n// \"AS IS\" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY\n// KIND, either express or implied. See the License for the\n// specific language governing permissions and limitations\n// under the License.\n\nimport * as Schema_ from './fb/Schema';\nimport * as Message_ from './fb/Message';\n\nexport import ArrowType = Schema_.org.apache.arrow.flatbuf.Type;\nexport import DateUnit = Schema_.org.apache.arrow.flatbuf.DateUnit;\nexport import TimeUnit = Schema_.org.apache.arrow.flatbuf.TimeUnit;\nexport import Precision = Schema_.org.apache.arrow.flatbuf.Precision;\nexport import UnionMode = Schema_.org.apache.arrow.flatbuf.UnionMode;\nexport import IntervalUnit = Schema_.org.apache.arrow.flatbuf.IntervalUnit;\nexport import MessageHeader = Message_.org.apache.arrow.flatbuf.MessageHeader;\nexport import MetadataVersion = Schema_.org.apache.arrow.flatbuf.MetadataVersion;\n\n/**\n * Main data type enumeration.\n *\n * Data types in this library are all *logical*. They can be expressed as\n * either a primitive physical type (bytes or bits of some fixed size), a\n * nested type consisting of other data types, or another data type (e.g. a\n * timestamp encoded as an int64).\n *\n * **Note**: Only enum values 0-17 (NONE through Map) are written to an Arrow\n * IPC payload.\n *\n * The rest of the values are specified here so TypeScript can narrow the type\n * signatures further beyond the base Arrow Types. The Arrow DataTypes include\n * metadata like `bitWidth` that impact the type signatures of the values we\n * accept and return.\n *\n * For example, the `Int8Vector` reads 1-byte numbers from an `Int8Array`, an\n * `Int32Vector` reads a 4-byte number from an `Int32Array`, and an `Int64Vector`\n * reads a pair of 4-byte lo, hi 32-bit integers as a zero-copy slice from the\n * underlying `Int32Array`.\n *\n * Library consumers benefit by knowing the narrowest type, since we can ensure\n * the types across all public methods are propagated, and never bail to `any`.\n * These values are _never_ used at runtime, and they will _never_ be written\n * to the flatbuffers metadata of serialized Arrow IPC payloads.\n */\nexport enum Type {\n /** The default placeholder type */\n NONE = 0,\n /** A NULL type having no physical storage */\n Null = 1,\n /** Signed or unsigned 8, 16, 32, or 64-bit little-endian integer */\n Int = 2,\n /** 2, 4, or 8-byte floating point value */\n Float = 3,\n /** Variable-length bytes (no guarantee of UTF8-ness) */\n Binary = 4,\n /** UTF8 variable-length string as List<Char> */\n Utf8 = 5,\n /** Boolean as 1 bit, LSB bit-packed ordering */\n Bool = 6,\n /** Precision-and-scale-based decimal type. Storage type depends on the parameters. */\n Decimal = 7,\n /** int32_t days or int64_t milliseconds since the UNIX epoch */\n Date = 8,\n /** Time as signed 32 or 64-bit integer, representing either seconds, milliseconds, microseconds, or nanoseconds since midnight since midnight */\n Time = 9,\n /** Exact timestamp encoded with int64 since UNIX epoch (Default unit millisecond) */\n Timestamp = 10,\n /** YEAR_MONTH or DAY_TIME interval in SQL style */\n Interval = 11,\n /** A list of some logical data type */\n List = 12,\n /** Struct of logical types */\n Struct = 13,\n /** Union of logical types */\n Union = 14,\n /** Fixed-size binary. Each value occupies the same number of bytes */\n FixedSizeBinary = 15,\n /** Fixed-size list. Each value occupies the same number of bytes */\n FixedSizeList = 16,\n /** Map of named logical types */\n Map = 17,\n\n /** Dictionary aka Category type */\n Dictionary = -1,\n Int8 = -2,\n Int16 = -3,\n Int32 = -4,\n Int64 = -5,\n Uint8 = -6,\n Uint16 = -7,\n Uint32 = -8,\n Uint64 = -9,\n Float16 = -10,\n Float32 = -11,\n Float64 = -12,\n DateDay = -13,\n DateMillisecond = -14,\n TimestampSecond = -15,\n TimestampMillisecond = -16,\n TimestampMicrosecond = -17,\n TimestampNanosecond = -18,\n TimeSecond = -19,\n TimeMillisecond = -20,\n TimeMicrosecond = -21,\n TimeNanosecond = -22,\n DenseUnion = -23,\n SparseUnion = -24,\n IntervalDayTime = -25,\n IntervalYearMonth = -26,\n}\n\nexport enum BufferType {\n /**\n * used in List type, Dense Union and variable length primitive types (String, Binary)\n */\n OFFSET = 0,\n\n /**\n * actual data, either wixed width primitive types in slots or variable width delimited by an OFFSET vector\n */\n DATA = 1,\n\n /**\n * Bit vector indicating if each value is null\n */\n VALIDITY = 2,\n\n /**\n * Type vector used in Union type\n */\n TYPE = 3\n }\n"]}