DB_CAST

DB_CAST( expression, native_type [ , param_1 [ , param_2 ] ] )

Converts the expression expression to database's native type native_type.

The following type casts are supported:

Data source	Data type	Native data type	Parameters for native type	Comment
`ClickHouse`	`Number (decimal)`	`Float32`
`ClickHouse`	`Number (decimal)`	`Float64`
`ClickHouse`	`Number (decimal)`	`Decimal`	`Number (whole)`, `Number (whole)`
`ClickHouse`	`Number (whole)`	`Int8`
`ClickHouse`	`Number (whole)`	`Int16`
`ClickHouse`	`Number (whole)`	`Int32`
`ClickHouse`	`Number (whole)`	`Int64`
`ClickHouse`	`String`	`String`
`PostgreSQL`	`Number (decimal)`	`double precision`
`PostgreSQL`	`Number (decimal)`	`real`
`PostgreSQL`	`Number (decimal)`	`numeric`	`Number (whole)`, `Number (whole)`
`PostgreSQL`	`Number (whole)`	`smallint`
`PostgreSQL`	`Number (whole)`	`integer`
`PostgreSQL`	`Number (whole)`	`bigint`
`PostgreSQL`	`String`	`text`
`PostgreSQL`	`String`	`character`	`Number (whole)`	Alias: `char`
`PostgreSQL`	`String`	`character varying`	`Number (whole)`	Alias: `varchar`
`PostgreSQL`	`String`	`char`	`Number (whole)`	Alias for `character`
`PostgreSQL`	`String`	`varchar`	`Number (whole)`	Alias for `character varying`

Argument types:

Return type: Same type as (expression)

Note

Only constant values are accepted for arguments (native_type).

DB_CAST([float_value], "Decimal", 10, 5)

DB_CAST([float_value], "double precision")

DB_CAST([float_value], "numeric", 10, 5)

Materialized Dataset, ClickHouse 1.1, PostgreSQL 9.3.