Data types - Amazon Simple Storage Service
Data type conversions Supported data types
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Data types

Amazon S3 Select supports several primitive data types.

Data type conversions

The general rule is to follow the CAST function if it's defined. If CAST is not defined, then all input data is treated as a string. In that case, you must cast your input data into the relevant data types when necessary.

For more information about the CAST function, see CAST.

Supported data types

Amazon S3 Select supports the following set of primitive data types.

Name

Description

Examples

bool

A Boolean value, either TRUE or FALSE.

FALSE

int, integer

An 8-byte signed integer in the range -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807.

100000

string

A UTF8-encoded variable-length string. The default limit is 1 character. The maximum character limit is 2,147,483,647.

'xyz'

float

An 8-byte floating point number.

CAST(0.456 AS FLOAT)

decimal, numeric

A base-10 number, with a maximum precision of 38 (that is, the maximum number of significant digits), and with a scale within the range of -231 to 231-1 (that is, the base-10 exponent).

Note

Amazon S3 Select ignores scale and precision when you provide both at the same time.

123.456

timestamp

Timestamps represent a specific moment in time, always include a local offset, and are capable of arbitrary precision.

In the text format, timestamps follow the W3C note on date and time formats, but they must end with the literal T if the timestamps are not at least whole-day precision. Fractional seconds are allowed, with at least one digit of precision, and an unlimited maximum. Local-time offsets can be represented as either hour:minute offsets from UTC, or as the literal Z to denote a local time of UTC. Local-time offsets are required on timestamps with time and are not allowed on date values.

CAST('2007-04-05T14:30Z' AS TIMESTAMP)

Supported Parquet types

Amazon S3 Select supports the following Parquet types.

  • DATE

  • DECIMAL

  • ENUM

  • INT(8)

  • INT(16)

  • INT(32)

  • INT(64)

  • LIST

    Note

    For LIST Parquet type output, Amazon S3 Select supports only JSON format. However, if the query limits the data to simple values, the LIST Parquet type can also be queried in CSV format.

  • STRING

  • TIMESTAMP supported precision (MILLIS/MICROS/NANOS)

    Note

    Timestamps saved as an INT(96) are unsupported.

    Because of the range of the INT(64) type, timestamps that are using the NANOS unit can represent only values between 1677-09-21 00:12:43 and 2262-04-11 23:47:16. Values outside of this range cannot be represented with the NANOS unit.

Mapping of Parquet types to supported data types in Amazon S3 Select

Parquet types

Supported data types

DATE

timestamp

DECIMAL

decimal, numeric

ENUM

string

INT(8)

int, integer

INT(16)

int, integer

INT(32)

int, integer

INT(64)

decimal, numeric

LIST

Each Parquet type in list is mapped to the corresponding data type.

STRING

string

TIMESTAMP

timestamp