Function tryExtractConstantFromConditionNode

src/Analyzer/Utils.cpp:372–391

}

std::optional<bool> tryExtractConstantFromConditionNode(const QueryTreeNodePtr & condition_node)
{
    const auto * constant_node = condition_node ? condition_node->as<ConstantNode>() : nullptr;
    if (!constant_node)
        return {};

    const auto & value = constant_node->getValue();
    auto constant_type = constant_node->getResultType();
    constant_type = removeNullable(removeLowCardinality(constant_type));

    auto which_constant_type = WhichDataType(constant_type);
    if (!which_constant_type.isUInt8() && !which_constant_type.isNothing())
        return {};

    if (value.isNull())
        return false;

    auto predicate_value = static_cast<UInt8>(value.safeGet<UInt8>());
    return predicate_value > 0;
}

static ASTPtr convertIntoTableExpressionAST(
    const QueryTreeNodePtr & table_expression_node,