[Tile-serving] [openstreetmap/osm2pgsql] Flex: Add support for configuring table indexes in the Lua config (PR #1847)

[Jochen Topf]

@joto commented on this pull request.



> +#include <string>
+#include <vector>
+
+/**
+ * This class represents a database index.
+ */
+class flex_index_t
+{
+public:
+    explicit flex_index_t(std::string method) : m_method(std::move(method)) {}
+
+    std::string const &method() const noexcept { return m_method; }
+
+    std::string columns() const;
+
+    void set_columns(std::string const &columns)

This is not intended for adding columns one at a time, but an overload of the `void set_columns(std::vector<std::string> const &columns)` function so that we don't have to create a vector if all we want is to add a single column.

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