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

[Jochen Topf]

The table definitions have a new (optional) field called "indexes" now which takes a list of index definitions. If the field is not there, we fall back to what we did before, a GIST index on the only/first geometry column of table is created. To disable indexes, set to an empty array.

See the flex-config/indexes.lua Lua config for some usage examples.

See #1780
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1847

-- Commit Summary --

  * Flex: Add support for configuring table indexes in the Lua config

-- File Changes --

    A flex-config/indexes.lua (155)
    M src/CMakeLists.txt (1)
    A src/flex-index.cpp (66)
    A src/flex-index.hpp (96)
    M src/flex-table.cpp (24)
    M src/flex-table.hpp (13)
    M src/lua-utils.cpp (4)
    M src/output-flex.cpp (180)
    M src/output-flex.hpp (1)
    M tests/CMakeLists.txt (2)
    A tests/bdd/flex/lua-index-definitions.feature (474)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1847.patch
https://github.com/openstreetmap/osm2pgsql/pull/1847.diff

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