[Tile-serving] [osm2pgsql] Schema tests (#415)

[Paul Norman]

Rebased, but now getting errors on the python regression tests.

```
======================================================================
FAIL: runTest (__main__.MultipolygonSlimTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "tests/regression-test.py", line 461, in runTest
    self.executeStatements(self.postDiffStatements)
  File "tests/regression-test.py", line 362, in executeStatements
    str(res) + "  -- " + sql_test_statements[i][1] + " (" + sql_test_statements[i][2] + ") {" + str(self.parameters) +"}")
AssertionError: 34: Sql statement returned more than one result: [(12893.0,), (12893.0,)]  -- Multipolygon non-area inner - outer (Tags from relation) (SELECT round(ST_Area(way)) FROM planet_osm_polygon WHERE osm_id = -14 and landuse = 'residential' and name = 'Name_way5') {[]}

======================================================================
FAIL: runTest (__main__.MultipolygonSlimTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "tests/regression-test.py", line 461, in runTest
    self.executeStatements(self.postDiffStatements)
  File "tests/regression-test.py", line 362, in executeStatements
    str(res) + "  -- " + sql_test_statements[i][1] + " (" + sql_test_statements[i][2] + ") {" + str(self.parameters) +"}")
AssertionError: 34: Sql statement returned more than one result: [(12893.0,), (12893.0,)]  -- Multipolygon non-area inner - outer (Tags from relation) (SELECT round(ST_Area(way)) FROM planet_osm_polygon WHERE osm_id = -14 and landuse = 'residential' and name = 'Name_way5') {['-G']}

======================================================================
FAIL: runTest (__main__.MultipolygonSlimTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "tests/regression-test.py", line 461, in runTest
    self.executeStatements(self.postDiffStatements)
  File "tests/regression-test.py", line 362, in executeStatements
    str(res) + "  -- " + sql_test_statements[i][1] + " (" + sql_test_statements[i][2] + ") {" + str(self.parameters) +"}")
AssertionError: 34: Sql statement returned more than one result: [(12893.0,), (12893.0,)]  -- Multipolygon non-area inner - outer (Tags from relation) (SELECT round(ST_Area(way)) FROM planet_osm_polygon WHERE osm_id = -14 and landuse = 'residential' and name = 'Name_way5') {['-k']}

======================================================================
FAIL: runTest (__main__.MultipolygonSlimTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "tests/regression-test.py", line 461, in runTest
    self.executeStatements(self.postDiffStatements)
  File "tests/regression-test.py", line 362, in executeStatements
    str(res) + "  -- " + sql_test_statements[i][1] + " (" + sql_test_statements[i][2] + ") {" + str(self.parameters) +"}")
AssertionError: 34: Sql statement returned more than one result: [(12893.0,), (12893.0,)]  -- Multipolygon non-area inner - outer (Tags from relation) (SELECT round(ST_Area(way)) FROM planet_osm_polygon WHERE osm_id = -14 and landuse = 'residential' and name = 'Name_way5') {['-x', '-k', '--hstore-match-only']}

======================================================================
FAIL: runTest (__main__.MultipolygonSlimTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "tests/regression-test.py", line 461, in runTest
    self.executeStatements(self.postDiffStatements)
  File "tests/regression-test.py", line 362, in executeStatements
    str(res) + "  -- " + sql_test_statements[i][1] + " (" + sql_test_statements[i][2] + ") {" + str(self.parameters) +"}")
AssertionError: 75: Sql statement returned more than one result: [(15246.0,), (15246.0,)]  -- Multipolygon tags on both inner and outer diff change outer (presence of relation) (SELECT round(ST_Area(way)) FROM planet_osm_polygon WHERE osm_id = -34 and "landuse" = 'farmland') {['--tag-transform-script', 'style.lua', '-k']}

----------------------------------------------------------------------
```

I'm bisecting, since I really doubt it's caused by this PR, which only touches the C++ tests.

---
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/415#issuecomment-126214911
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