arrow_flight::sql

Struct CommandGetXdbcTypeInfo

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pub struct CommandGetXdbcTypeInfo {
    pub data_type: Option<i32>,
}
Expand description

Represents a request to retrieve information about data type supported on a Flight SQL enabled backend. Used in the command member of FlightDescriptor for the following RPC calls:

  • GetSchema: return the schema of the query.
  • GetFlightInfo: execute the catalog metadata request.

The returned schema will be: < type_name: utf8 not null (The name of the data type, for example: VARCHAR, INTEGER, etc), data_type: int32 not null (The SQL data type), column_size: int32 (The maximum size supported by that column. In case of exact numeric types, this represents the maximum precision. In case of string types, this represents the character length. In case of datetime data types, this represents the length in characters of the string representation. NULL is returned for data types where column size is not applicable.), literal_prefix: utf8 (Character or characters used to prefix a literal, NULL is returned for data types where a literal prefix is not applicable.), literal_suffix: utf8 (Character or characters used to terminate a literal, NULL is returned for data types where a literal suffix is not applicable.), create_params: list (A list of keywords corresponding to which parameters can be used when creating a column for that specific type. NULL is returned if there are no parameters for the data type definition.), nullable: int32 not null (Shows if the data type accepts a NULL value. The possible values can be seen in the Nullable enum.), case_sensitive: bool not null (Shows if a character data type is case-sensitive in collations and comparisons), searchable: int32 not null (Shows how the data type is used in a WHERE clause. The possible values can be seen in the Searchable enum.), unsigned_attribute: bool (Shows if the data type is unsigned. NULL is returned if the attribute is not applicable to the data type or the data type is not numeric.), fixed_prec_scale: bool not null (Shows if the data type has predefined fixed precision and scale.), auto_increment: bool (Shows if the data type is auto incremental. NULL is returned if the attribute is not applicable to the data type or the data type is not numeric.), local_type_name: utf8 (Localized version of the data source-dependent name of the data type. NULL is returned if a localized name is not supported by the data source), minimum_scale: int32 (The minimum scale of the data type on the data source. If a data type has a fixed scale, the MINIMUM_SCALE and MAXIMUM_SCALE columns both contain this value. NULL is returned if scale is not applicable.), maximum_scale: int32 (The maximum scale of the data type on the data source. NULL is returned if scale is not applicable.), sql_data_type: int32 not null (The value of the SQL DATA TYPE which has the same values as data_type value. Except for interval and datetime, which uses generic values. More info about those types can be obtained through datetime_subcode. The possible values can be seen in the XdbcDataType enum.), datetime_subcode: int32 (Only used when the SQL DATA TYPE is interval or datetime. It contains its sub types. For type different from interval and datetime, this value is NULL. The possible values can be seen in the XdbcDatetimeSubcode enum.), num_prec_radix: int32 (If the data type is an approximate numeric type, this column contains the value 2 to indicate that COLUMN_SIZE specifies a number of bits. For exact numeric types, this column contains the value 10 to indicate that column size specifies a number of decimal digits. Otherwise, this column is NULL.), interval_precision: int32 (If the data type is an interval data type, then this column contains the value of the interval leading precision. Otherwise, this column is NULL. This fields is only relevant to be used by ODBC).

The returned data should be ordered by data_type and then by type_name.

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§data_type: Option<i32>

Specifies the data type to search for the info.

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impl CommandGetXdbcTypeInfo

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pub fn data_type(&self) -> i32

Returns the value of data_type, or the default value if data_type is unset.

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impl CommandGetXdbcTypeInfo

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pub fn into_builder( self, infos: &XdbcTypeInfoData, ) -> GetXdbcTypeInfoBuilder<'_>

Create a builder suitable for constructing a response

Trait Implementations§

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impl Clone for CommandGetXdbcTypeInfo

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fn clone(&self) -> CommandGetXdbcTypeInfo

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for CommandGetXdbcTypeInfo

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Default for CommandGetXdbcTypeInfo

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl Message for CommandGetXdbcTypeInfo

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fn encoded_len(&self) -> usize

Returns the encoded length of the message without a length delimiter.
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fn clear(&mut self)

Clears the message, resetting all fields to their default.
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fn encode(&self, buf: &mut impl BufMut) -> Result<(), EncodeError>
where Self: Sized,

Encodes the message to a buffer. Read more
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fn encode_to_vec(&self) -> Vec<u8>
where Self: Sized,

Encodes the message to a newly allocated buffer.
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fn encode_length_delimited( &self, buf: &mut impl BufMut, ) -> Result<(), EncodeError>
where Self: Sized,

Encodes the message with a length-delimiter to a buffer. Read more
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fn encode_length_delimited_to_vec(&self) -> Vec<u8>
where Self: Sized,

Encodes the message with a length-delimiter to a newly allocated buffer.
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fn decode(buf: impl Buf) -> Result<Self, DecodeError>
where Self: Default,

Decodes an instance of the message from a buffer. Read more
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fn decode_length_delimited(buf: impl Buf) -> Result<Self, DecodeError>
where Self: Default,

Decodes a length-delimited instance of the message from the buffer.
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fn merge(&mut self, buf: impl Buf) -> Result<(), DecodeError>
where Self: Sized,

Decodes an instance of the message from a buffer, and merges it into self. Read more
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fn merge_length_delimited(&mut self, buf: impl Buf) -> Result<(), DecodeError>
where Self: Sized,

Decodes a length-delimited instance of the message from buffer, and merges it into self.
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impl PartialEq for CommandGetXdbcTypeInfo

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fn eq(&self, other: &CommandGetXdbcTypeInfo) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl ProstMessageExt for CommandGetXdbcTypeInfo

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fn type_url() -> &'static str

type_url for this Message
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fn as_any(&self) -> Any

Convert this Message to Any
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impl Copy for CommandGetXdbcTypeInfo

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impl StructuralPartialEq for CommandGetXdbcTypeInfo

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impl<T> Any for T
where T: 'static + ?Sized,

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Gets the TypeId of self. Read more
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unsafe fn clone_to_uninit(&self, dst: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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