Data Types¶

DataFusion uses Arrow, and thus the Arrow type system, for query execution. The SQL types from sqlparser-rs are mapped to Arrow data types according to the following table. This mapping occurs when defining the schema in a CREATE EXTERNAL TABLE command or when performing a SQL CAST operation.

Character Types¶

SQL DataType	Arrow DataType
`CHAR`	`Utf8`
`VARCHAR`	`Utf8`
`TEXT`	`Utf8`

Numeric Types¶

SQL DataType	Arrow DataType	Notes
`TINYINT`	`Int8`
`SMALLINT`	`Int16`
`INT` or `INTEGER`	`Int32`
`BIGINT`	`Int64`
`TINYINT UNSIGNED`	`UInt8`
`SMALLINT UNSIGNED`	`UInt16`
`INT UNSIGNED` or `INTEGER UNSIGNED`	`UInt32`
`BIGINT UNSIGNED`	`UInt64`
`FLOAT`	`Float32`
`REAL`	`Float32`
`DOUBLE`	`Float64`
`DECIMAL(precision,scale)`	`Decimal128(precision,scale)`	Decimal support is currently experimental (#3523)

Date/Time Types¶

SQL DataType	Arrow DataType
`DATE`	`Date32`
`TIME`	`Time64(TimeUnit::Nanosecond)`
`TIMESTAMP`	`Timestamp(TimeUnit::Nanosecond, None)`

Boolean Types¶

SQL DataType	Arrow DataType
`BOOLEAN`	`Boolean`

Binary Types¶

SQL DataType	Arrow DataType
`BYTEA`	`Binary`

Unsupported Types¶

SQL Data Type	Arrow DataType
`UUID`	Not yet supported
`BLOB`	Not yet supported
`CLOB`	Not yet supported
`BINARY`	Not yet supported
`VARBINARY`	Not yet supported
`REGCLASS`	Not yet supported
`NVARCHAR`	Not yet supported
`STRING`	Not yet supported
`CUSTOM`	Not yet supported
`ARRAY`	Not yet supported
`ENUM`	Not yet supported
`SET`	Not yet supported
`INTERVAL`	Not yet supported
`DATETIME`	Not yet supported

SQL Reference

SELECT syntax