MORE TESTS + fixed count(*) issue

Author: 1NepuNep1

internal/endtoend/testdata/coalesce/ydb/stdlib/go/db.go

@@ -0,0 +1,23 @@
+-- name: CoalesceString :many
+SELECT COALESCE(bar, '') AS login
+FROM foo;
+
+-- name: CoalesceNumeric :many
+SELECT COALESCE(baz, 0) AS login
+FROM foo;
+
+-- name: CoalesceStringColumns :many
+SELECT bar, bat, COALESCE(bar, bat)
+FROM foo;
+
+-- name: CoalesceNumericColumns :many
+SELECT baz, qux, COALESCE(baz, qux)
+FROM foo;
+
+-- name: CoalesceStringNull :many
+SELECT bar, COALESCE(bar)
+FROM foo;
+
+-- name: CoalesceNumericNull :many
+SELECT baz, COALESCE(baz)
+FROM foo;

internal/endtoend/testdata/coalesce/ydb/stdlib/go/models.go

@@ -0,0 +1,7 @@
+CREATE TABLE foo (
+  bar Text,
+  bat Text NOT NULL,
+  baz Int64,
+  qux Int64 NOT NULL,
+  PRIMARY KEY (bat, qux)
+);

internal/endtoend/testdata/coalesce/ydb/stdlib/go/query.sql.go

@@ -0,0 +1,12 @@
+{
+  "version": "1",
+  "packages": [
+    {
+      "path": "go",
+      "engine": "ydb",
+      "name": "querytest",
+      "schema": "schema.sql",
+      "queries": "query.sql"
+    }
+  ]
+}