Module database

Module with database related functionality. In particular, this module contains the accessor traits and the OwnedTable type along with some utility functions to convert between Arrow and OwnedTable.

Re-exports

• pub use crate::base::arrow::arrow_array_to_column_conversion::ArrayRefExt;
• pub use crate::base::arrow::arrow_array_to_column_conversion::ArrowArrayToColumnConversionError;
• pub use crate::base::arrow::owned_and_arrow_conversions::OwnedArrowConversionError;
• pub use crate::base::arrow::record_batch_utility::ToArrow;
• pub use crate::base::arrow::scalar_and_i256_conversions;

Modules

• arrow_schema_utility
  This module provides utility functions for working with Arrow schemas in the context of Proof of SQL. It includes functionality to convert Arrow schemas to PoSQL-compatible formats.
• owned_table_utility
  Utility functions for creating OwnedTables and OwnedColumns. These functions are primarily intended for use in tests.
• table_utility
  Utility functions for creating Tables and Columns. These functions are primarily intended for use in tests.

Structs

• ColumnField
  This type is used to represent the metadata of a column in a table. Namely: it’s name and type.
• ColumnRef
  Reference of a SQL column
• OwnedTable
  A table of data, with schema included. This is simply a map from Ident to OwnedColumn, where columns order matters. This is primarily used as an internal result that is used before converting to the final result in either Arrow format or JSON. This is the analog of an arrow RecordBatch.
• OwnedTableTestAccessor
  A test accessor that uses OwnedTable as the underlying table type. Note: this is intended for testing and examples. It is not optimized for performance, so should not be used for benchmarks or production use-cases.
• Table
  A table of data, with schema included. This is simply a map from Ident to Column, where columns order matters. This is primarily used as an internal result that is used before converting to the final result in either Arrow format or JSON. This is the analog of an arrow RecordBatch.
• TableEvaluation
  The result of evaluating a table
• TableOptions
  Options for creating a table. Inspired by RecordBatchOptions
• TableRef
  Expression for an SQL table
• TableTestAccessor
  A test accessor that uses Table as the underlying table type. Note: this is intended for testing and examples. It is not optimized for performance, so should not be used for benchmarks or production use-cases.

Enums

• Column
  Represents a read-only view of a column in an in-memory, column-oriented database.
• ColumnOperationError
  Errors from operations on columns.
• ColumnType
  Represents the supported data types of a column in an in-memory, column-oriented database.
• ColumnarValue
  The result of evaluating an expression.
• ExpressionEvaluationError
  Errors from evaluation of Expressions.
• LiteralValue
  Represents a literal value.
• OwnedColumn
  Supported types for OwnedColumn
• OwnedColumnError
  Errors from operations related to OwnedColumns.
• TableOperationError
  Errors from operations on tables.

Traits

• CommitmentAccessor
  Access commitments of database columns.
• DataAccessor
  Access database columns of an in-memory table span.
• MetadataAccessor
  Access metadata of a table span in a database.
• SchemaAccessor
  Access tables and their schemas in a database.
• TestAccessor
  A trait that defines the interface for a combined metadata, schema, commitment, and data accessor for unit testing or example purposes.

Functions

• try_add_subtract_column_types
  Determine the output type of an add or subtract operation if it is possible to add or subtract the two input types. If the types are not compatible, return an error.
• try_divide_column_types
  Determine the output type of a division operation if it is possible to multiply the two input types. If the types are not compatible, return an error.
• try_multiply_column_types
  Determine the output type of a multiplication operation if it is possible to multiply the two input types. If the types are not compatible, return an error.

Type Aliases

• ColumnOperationResult
  Result type for column operations
• ExpressionEvaluationResult
  Result type for expression evaluation
• OwnedColumnResult
  Result type for operations related to OwnedColumns.
• TableOperationResult
  Result type for table operations