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SqlTableSource

datafusion_python::common::schema

Struct SqlTableSource 

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pub struct SqlTableSource { /* private fields */ }
Expand description

SqlTable wrapper that is compatible with DataFusion logical query plans

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impl SqlTableSource

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pub fn new( schema: SchemaRef, statistics: Option<SqlStatistics>, filepaths: Option<Vec<String>>, ) -> Self

Initialize a new EmptyTable from a schema

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pub fn statistics(&self) -> Option<&SqlStatistics>

Access optional statistics associated with this table source

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pub fn filepaths(&self) -> Option<&Vec<String>>

Access optional filepath associated with this table source

Trait Implementations§

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impl TableSource for SqlTableSource

Implement TableSource, used in the logical query plan and in logical query optimizations

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fn schema(&self) -> SchemaRef

Get a reference to the schema for this table
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fn table_type(&self) -> TableType

Get the type of this table for metadata/catalog purposes.
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fn supports_filters_pushdown( &self, filters: &[&Expr], ) -> Result<Vec<TableProviderFilterPushDown>>

Tests whether the table provider can make use of any or all filter expressions to optimize data retrieval. Only non-volatile expressions are passed to this function.
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fn get_logical_plan(&self) -> Option<Cow<'_, LogicalPlan>>

Get the Logical plan of this table provider, if available. Read more
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fn constraints(&self) -> Option<&Constraints>

Get primary key indices, if any
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fn get_column_default(&self, _column: &str) -> Option<&Expr>

Get the default value for a column, if available.

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