Class TableExpressionModifiers

src/Analyzer/TableExpressionModifiers.h:17–101

Modifiers that can be used for table, table function and subquery in JOIN TREE. * * Example: SELECT * FROM test_table SAMPLE 0.1 OFFSET 0.1 FINAL */

  * Example: SELECT * FROM test_table SAMPLE 0.1 OFFSET 0.1 FINAL
  */
class TableExpressionModifiers
{
public:
    using Rational = ASTSampleRatio::Rational;

    struct StreamSettings
    {
        /// Null means "no cursor" (read from the beginning of the table).
        CursorTreeNodePtr cursor_tree;
    };

    TableExpressionModifiers() = default;
    TableExpressionModifiers(bool has_final_,
        std::optional<Rational> sample_size_ratio_,
        std::optional<Rational> sample_offset_ratio_,
        std::optional<StreamSettings> stream_settings_ = {})
        : has_final(has_final_)
        , sample_size_ratio(sample_size_ratio_)
        , sample_offset_ratio(sample_offset_ratio_)
        , stream_settings(std::move(stream_settings_))
    {}

    /// Returns true if final is specified, false otherwise
    bool hasFinal() const
    {
        return has_final;
    }

    /// Set has final value
    void setHasFinal(bool value)
    {
        has_final = value;
    }

    /// Returns true if sample size ratio is specified, false otherwise
    bool hasSampleSizeRatio() const
    {
        return sample_size_ratio.has_value();
    }

    /// Get sample size ratio
    std::optional<Rational> getSampleSizeRatio() const
    {
        return sample_size_ratio;
    }

    /// Returns true if sample offset ratio is specified, false otherwise
    bool hasSampleOffsetRatio() const
    {
        return sample_offset_ratio.has_value();
    }

    /// Get sample offset ratio
    std::optional<Rational> getSampleOffsetRatio() const
    {
        return sample_offset_ratio;
    }