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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
syntax = "proto2";
package quickstep.serialization;
import "types/Type.proto";
import "types/TypedValue.proto";
import "types/operations/Operation.proto";
// ----------------------------------------------------------------------------
// Base message types.
message Predicate {
enum PredicateType {
TRUE = 0;
FALSE = 1;
COMPARISON = 2;
NEGATION = 3;
CONJUNCTION = 4;
DISJUNCTION = 5;
}
required PredicateType predicate_type = 1;
// The convention for extension numbering is that extensions for a particular
// PredicateType should begin from (predicate_type + 1) * 32.
extensions 32 to max;
}
message Scalar {
enum ScalarDataSource {
LITERAL = 0;
ATTRIBUTE = 1;
UNARY_EXPRESSION = 2;
BINARY_EXPRESSION = 3;
CASE_EXPRESSION = 4;
SHARED_EXPRESSION = 5;
}
required ScalarDataSource data_source = 1;
// The convention for extension numbering is that extensions for a particular
// ScalarDataSource should begin from (data_source + 1) * 32.
extensions 32 to max;
}
// ----------------------------------------------------------------------------
// Extensions for Predicate.
message ComparisonPredicate {
extend Predicate {
optional Comparison comparison = 96;
optional Scalar left_operand = 97;
optional Scalar right_operand = 98;
}
}
message NegationPredicate {
extend Predicate {
optional Predicate operand = 128;
}
}
// Either ConjunctionPredicate or DisjunctionPredicate.
message PredicateWithList {
extend Predicate {
repeated Predicate operands = 160;
}
}
// ----------------------------------------------------------------------------
// Extensions for Scalar.
message ScalarLiteral {
extend Scalar {
optional TypedValue literal = 32;
optional Type literal_type = 33;
}
}
message ScalarAttribute {
extend Scalar {
optional int32 relation_id = 64;
optional int32 attribute_id = 65;
}
}
message ScalarUnaryExpression {
extend Scalar {
optional UnaryOperation operation = 96;
optional Scalar operand = 97;
}
}
message ScalarBinaryExpression {
extend Scalar {
optional BinaryOperation operation = 128;
optional Scalar left_operand = 129;
optional Scalar right_operand = 130;
}
}
message ScalarCaseExpression {
extend Scalar {
optional Type result_type = 160;
repeated Predicate when_predicate = 161;
repeated Scalar result_expression = 162;
optional Scalar else_result_expression = 163;
}
}
message ScalarSharedExpression {
extend Scalar {
optional int32 share_id = 196;
optional Scalar operand = 197;
}
}