Crate repr

Fundamental data representation.

This module contains the types for representing data in Materialize that all layers of the stack can understand. Think of it as the lingua franca: individual layers may use different representations internally, but they all agree to use this representation at their boundaries.

• The core value type is the Datum enum, which represents a literal value.
• Row extends a Datum horizontally, and has features for efficiently doing so.
• RelationDesc describes what it takes to extend a Row vertically, and corresponds most closely to what is returned from querying our dataflows

Modules

adt

Abstract data types.

datum_vec

A re-useable vector of Datum with varying lifetimes.

gen

Generated protobuf code and companion impls.

relation

row

scalar

strconv

Routines for converting datum values to and from their string representation.

util

Utility routines for data representation.

Structs

ColumnName

The name of a column in a RelationDesc.

ColumnType

The type of a Datum.

DatumList

A sequence of Datums

DatumMap

A mapping from string keys to Datums

DatumVec

A re-useable vector of Datum with no particular lifetime.

DatumVecBorrow

A borrowed allocation of Datum with a specific lifetime.

NotNullViolation

Expression violated not-null constraint on named column

RelationDesc

A description of the shape of a relation.

RelationType

The type of a relation.

Row

A packed representation for Datums.

RowArena

RowArena is used to hold on to temporary Rows for functions like eval that need to create complex Datums but don’t have a Row to put them in yet.

RowRef

A wrapper around a byte slice that guarantees the data are row-formatted.

Enums

Datum

A single value.

MessagePayload

The payload delivered by a source connector; either bytes or an EOF marker.

ScalarBaseType

ScalarType

The type of a Datum.

Traits

AsColumnType

Types that implement this trait can be stored in an SQL column with the specified ColumnType

DatumType

A bridge between native Rust types and SQL runtime types represented in Datums

Functions

datum_list_size

Number of bytes required by a list of datums. This computes the size that would be required if the given datums were packed into a list.

datum_size

Number of bytes required by the datum.

datums_size

Number of bytes required by a sequence of datums.

row_size

Return the number of bytes these Datums would use if packed as a Row.

Type Definitions

Diff

System-wide record count difference type.

Timestamp

System-wide timestamp type.