CalciteSerializer¶

Public API¶

class modin.experimental.engines.omnisci_on_native.frame.calcite_serializer.CalciteSerializer¶

Serializer for calcite node sequence.

CalciteSerializer is used to serialize a sequence of CalciteBaseNode based nodes including nested BaseExpr based expression trees into a request in JSON format which can be fed to OmniSci.

expect_one_of(val, *types)¶

Raise an error if values doesn’t belong to any of specified types.

Parameters

val (Any) – Value to check.
*types (list of type) – Allowed value types.

opts_for_int_type(int_type)¶

Get serialization params for an integer type.

Return a SQL type name and a number of meaningful decimal digits for an integer type.

Parameters: int_type (type) – An integer type to describe.
Returns
Return type: tuple

serialize(plan)¶

Serialize a sequence of Calcite nodes into JSON format.

Parameters: plan (list of CalciteBaseNode) – A sequence to serialize.
Returns: A query in JSON format.
Return type: str

serialize_dtype(dtype)¶

Serialize data type to a dictionary.

Parameters: dtype (dtype) – Data type to serialize.
Returns: Serialized data type.
Return type: dict

serialize_expr(expr)¶

Serialize BaseExpr based expression into a dictionary.

Parameters: expr (BaseExpr) – An expression to serialize.
Returns: Serialized expression.
Return type: dict

serialize_input_idx(expr)¶

Serialize CalciteInputIdxExpr expression.

Parameters: expr (CalciteInputIdxExpr) – An expression to serialize.
Returns: Serialized expression.
Return type: int

serialize_item(item)¶

Serialize a single expression item.

Parameters: item (Any) – Item to serialize.
Returns: Serialized item.
Return type: str, int, dict or list of dict

serialize_literal(literal)¶

Serialize LiteralExpr into a dictionary.

Parameters: literal (LiteralExpr) – A literal to serialize.
Returns: Serialized literal.
Return type: dict

serialize_node(node)¶

Serialize a frame operation.

Parameters: node (CalciteBaseNode) – A node to serialize.
Returns: Serialized object.
Return type: dict

serialize_obj(obj)¶

Serialize an object into a dictionary.

Add all non-hidden attributes (not starting with ‘_’) of the object to the output dictionary.

Parameters: obj (object) – An object to serialize.
Returns: Serialized object.
Return type: dict

serialize_typed_obj(obj)¶

Serialize an object and its dtype into a dictionary.

Similar to serialize_obj but also include ‘_dtype’ field of the object under ‘type’ key.

Parameters: obj (object) – An object to serialize.
Returns: Serialized object.
Return type: dict