test: check decimal filters

Module uses cdata string cast for decimal filters. Later they are
compared to decimal objects and casted back, so everything already works
fine.

Part of #373

test/entrypoint/srv_select/storage_init.lua

@@ -1,4 +1,5 @@
 local datetime_supported, _ = pcall(require, 'datetime')
+local decimal_supported, _ = pcall(require, 'decimal')
 local crud_utils = require('crud.common.utils')
 
 return function()
@@ -229,6 +230,102 @@ return function()
         if_not_exists = true,
     })
 
+    if decimal_supported then
+        local decimal_format = {
+            {name = 'id', type = 'unsigned'},
+            {name = 'bucket_id', type = 'unsigned'},
+            {name = 'decimal_field', type = 'decimal'},
+        }
+
+
+        local decimal_nonindexed_space = box.schema.space.create('decimal_nonindexed', {
+            if_not_exists = true,
+            engine = engine,
+        })
+
+        decimal_nonindexed_space:format(decimal_format)
+
+        decimal_nonindexed_space:create_index('id_index', {
+            parts = { 'id' },
+            if_not_exists = true,
+        })
+
+        decimal_nonindexed_space:create_index('bucket_id', {
+            parts = { 'bucket_id' },
+            unique = false,
+            if_not_exists = true,
+        })
+
+
+        local decimal_indexed_space = box.schema.space.create('decimal_indexed', {
+            if_not_exists = true,
+            engine = engine,
+        })
+
+        decimal_indexed_space:format(decimal_format)
+
+        decimal_indexed_space:create_index('id_index', {
+            parts = { 'id' },
+            if_not_exists = true,
+        })
+
+        decimal_indexed_space:create_index('bucket_id', {
+            parts = { 'bucket_id' },
+            unique = false,
+            if_not_exists = true,
+        })
+
+        decimal_indexed_space:create_index('decimal_index', {
+            parts = { 'decimal_field' },
+            unique = false,
+            if_not_exists = true,
+        })
+
+
+        local decimal_pk_space = box.schema.space.create('decimal_pk', {
+            if_not_exists = true,
+            engine = engine,
+        })
+
+        decimal_pk_space:format(decimal_format)
+
+        decimal_pk_space:create_index('decimal_index', {
+            parts = { 'decimal_field' },
+            if_not_exists = true,
+        })
+
+        decimal_pk_space:create_index('bucket_id', {
+            parts = { 'bucket_id' },
+            unique = false,
+            if_not_exists = true,
+        })
+
+
+        local decimal_multipart_index_space = box.schema.space.create('decimal_multipart_index', {
+            if_not_exists = true,
+            engine = engine,
+        })
+
+        decimal_multipart_index_space:format(decimal_format)
+
+        decimal_multipart_index_space:create_index('id_index', {
+            parts = { 'id' },
+            if_not_exists = true,
+        })
+
+        decimal_multipart_index_space:create_index('bucket_id', {
+            parts = { 'bucket_id' },
+            unique = false,
+            if_not_exists = true,
+        })
+
+        decimal_multipart_index_space:create_index('decimal_index', {
+            parts = { 'id', 'decimal_field' },
+            unique = false,
+            if_not_exists = true,
+        })
+    end
+
     if datetime_supported then
         local datetime_format = {
             {name = 'id', type = 'unsigned'},

test/helper.lua

@@ -958,9 +958,32 @@ function helpers.prepare_ordered_data(g, space, expected_objects, bucket_id, ord
     t.assert_equals(objects, expected_objects)
 end
 
+function helpers.skip_decimal_unsupported()
+    local module_available, _ = pcall(require, 'decimal')
+    t.skip_if(not module_available, 'decimal is not supported')
+end
+
 function helpers.skip_datetime_unsupported()
     local module_available, _ = pcall(require, 'datetime')
     t.skip_if(not module_available, 'datetime is not supported')
 end
 
+function helpers.merge_tables(t1, t2, ...)
+    if t2 == nil then
+        return t1
+    end
+
+    local res = {}
+
+    for k, v in pairs(t1) do
+        res[k] = v
+    end
+
+    for k, v in pairs(t2) do
+        res[k] = v
+    end
+
+    return helpers.merge_tables(res, ...)
+end
+
 return helpers

test/integration/pairs_readview_test.lua

@@ -907,7 +907,12 @@ pgroup.test_gh_418_pairs_with_secondary_noneq_index_condition = function(g)
     read_scenario.gh_418_read_with_secondary_noneq_index_condition(g, read_impl)
 end
 
-for case_name_template, case in pairs(read_scenario.gh_373_read_with_datetime_condition_cases) do
+local gh_373_types_cases = helpers.merge_tables(
+    read_scenario.gh_373_read_with_decimal_condition_cases,
+    read_scenario.gh_373_read_with_datetime_condition_cases
+)
+
+for case_name_template, case in pairs(gh_373_types_cases) do
     local case_name = 'test_' .. case_name_template:format('pairs')
 
     pgroup[case_name] = function(g)

test/integration/pairs_test.lua

@@ -915,7 +915,12 @@ pgroup.test_gh_418_pairs_with_secondary_noneq_index_condition = function(g)
     read_scenario.gh_418_read_with_secondary_noneq_index_condition(g, read_impl)
 end
 
-for case_name_template, case in pairs(read_scenario.gh_373_read_with_datetime_condition_cases) do
+local gh_373_types_cases = helpers.merge_tables(
+    read_scenario.gh_373_read_with_decimal_condition_cases,
+    read_scenario.gh_373_read_with_datetime_condition_cases
+)
+
+for case_name_template, case in pairs(gh_373_types_cases) do
     local case_name = 'test_' .. case_name_template:format('pairs')
 
     pgroup[case_name] = function(g)