This is an automated email from the ASF dual-hosted git repository.

zeroshade pushed a commit to branch fixup-metadata-getobjects-snowflake
in repository https://gitbox.apache.org/repos/asf/arrow-adbc.git

commit 9acf8a8ab373cc9e249337d3677bfd3d7973b3c9
Author: Matt Topol <[email protected]>
AuthorDate: Wed Oct 16 12:04:05 2024 -0400

    updates to make tests work
---
 c/driver/snowflake/snowflake_test.cc               |   5 +-
 c/validation/adbc_validation_connection.cc         |   9 +-
 c/validation/adbc_validation_statement.cc          |   4 +-
 go/adbc/driver/internal/driverbase/connection.go   |   9 +-
 go/adbc/driver/snowflake/connection.go             | 160 ++++++++++++---------
 .../driver/snowflake/queries/get_objects_all.sql   |  18 +--
 .../snowflake/queries/get_objects_dbschemas.sql    |   4 +-
 .../snowflake/queries/get_objects_tables.sql       |  76 +---------
 8 files changed, 123 insertions(+), 162 deletions(-)

diff --git a/c/driver/snowflake/snowflake_test.cc 
b/c/driver/snowflake/snowflake_test.cc
index 60003353d..90735b3ff 100644
--- a/c/driver/snowflake/snowflake_test.cc
+++ b/c/driver/snowflake/snowflake_test.cc
@@ -131,7 +131,9 @@ class SnowflakeQuirks : public 
adbc_validation::DriverQuirks {
         return NANOARROW_TYPE_DOUBLE;
       case NANOARROW_TYPE_STRING:
       case NANOARROW_TYPE_LARGE_STRING:
-        return NANOARROW_TYPE_STRING;
+      case NANOARROW_TYPE_LIST:
+      case NANOARROW_TYPE_LARGE_LIST:
+        return NANOARROW_TYPE_STRING;        
       default:
         return ingest_type;
     }
@@ -150,6 +152,7 @@ class SnowflakeQuirks : public 
adbc_validation::DriverQuirks {
   bool supports_error_on_incompatible_schema() const override { return false; }
   bool ddl_implicit_commit_txn() const override { return true; }
   std::string db_schema() const override { return schema_; }
+  std::string catalog() const override { return "ADBC_TESTING"; }
 
   const char* uri_;
   bool skip_{false};
diff --git a/c/validation/adbc_validation_connection.cc 
b/c/validation/adbc_validation_connection.cc
index a885fa2c8..6ef430213 100644
--- a/c/validation/adbc_validation_connection.cc
+++ b/c/validation/adbc_validation_connection.cc
@@ -701,9 +701,8 @@ void ConnectionTest::TestMetadataGetObjectsTablesTypes() {
              db_schemas_index <
              ArrowArrayViewListChildOffset(catalog_db_schemas_list, row + 1);
              db_schemas_index++) {
-          ASSERT_FALSE(ArrowArrayViewIsNull(db_schema_tables_list, 
db_schemas_index))
-              << "Row " << row << " should have non-null db_schema_tables";
-
+          
+          // db_schema_tables should either be null or an empty list
           for (int64_t tables_index =
                    ArrowArrayViewListChildOffset(db_schema_tables_list, 
db_schemas_index);
                tables_index <
@@ -752,6 +751,8 @@ void ConnectionTest::TestMetadataGetObjectsColumns() {
   test_cases.push_back({std::nullopt, {"int64s", "strings"}, {1, 2}});
   test_cases.push_back({"in%", {"int64s"}, {1}});
 
+  const std::string catalog = quirks()->catalog();
+
   for (const auto& test_case : test_cases) {
     std::string scope = "Filter: ";
     scope += test_case.filter ? *test_case.filter : "(no filter)";
@@ -763,7 +764,7 @@ void ConnectionTest::TestMetadataGetObjectsColumns() {
 
     ASSERT_THAT(
         AdbcConnectionGetObjects(
-            &connection, ADBC_OBJECT_DEPTH_COLUMNS, nullptr, nullptr, nullptr, 
nullptr,
+            &connection, ADBC_OBJECT_DEPTH_COLUMNS, catalog.c_str(), nullptr, 
nullptr, nullptr,
             test_case.filter.has_value() ? test_case.filter->c_str() : nullptr,
             &reader.stream.value, &error),
         IsOkStatus(&error));
diff --git a/c/validation/adbc_validation_statement.cc 
b/c/validation/adbc_validation_statement.cc
index 07ab0b22a..19166d852 100644
--- a/c/validation/adbc_validation_statement.cc
+++ b/c/validation/adbc_validation_statement.cc
@@ -2218,7 +2218,7 @@ void StatementTest::TestSqlBind() {
 
   ASSERT_THAT(
       AdbcStatementSetSqlQuery(
-          &statement, "SELECT * FROM bindtest ORDER BY \"col1\" ASC NULLS 
FIRST", &error),
+          &statement, "SELECT * FROM bindtest ORDER BY col1 ASC NULLS FIRST", 
&error),
       IsOkStatus(&error));
   {
     StreamReader reader;
@@ -2226,7 +2226,7 @@ void StatementTest::TestSqlBind() {
                                           &reader.rows_affected, &error),
                 IsOkStatus(&error));
     ASSERT_THAT(reader.rows_affected,
-                ::testing::AnyOf(::testing::Eq(0), ::testing::Eq(-1)));
+                ::testing::AnyOf(::testing::Eq(3), ::testing::Eq(-1)));
 
     ASSERT_NO_FATAL_FAILURE(reader.GetSchema());
     ASSERT_NO_FATAL_FAILURE(reader.Next());
diff --git a/go/adbc/driver/internal/driverbase/connection.go 
b/go/adbc/driver/internal/driverbase/connection.go
index 37433e0ce..b09f74e30 100644
--- a/go/adbc/driver/internal/driverbase/connection.go
+++ b/go/adbc/driver/internal/driverbase/connection.go
@@ -624,20 +624,20 @@ type ColumnInfo struct {
 type TableInfo struct {
        TableName        string           `json:"table_name"`
        TableType        string           `json:"table_type"`
-       TableColumns     []ColumnInfo     `json:"table_columns,omitempty"`
-       TableConstraints []ConstraintInfo `json:"table_constraints,omitempty"`
+       TableColumns     []ColumnInfo     `json:"table_columns"`
+       TableConstraints []ConstraintInfo `json:"table_constraints"`
 }
 
 // DBSchemaInfo is a structured representation of adbc.DBSchemaSchema
 type DBSchemaInfo struct {
        DbSchemaName   *string     `json:"db_schema_name,omitempty"`
-       DbSchemaTables []TableInfo `json:"db_schema_tables,omitempty"`
+       DbSchemaTables []TableInfo `json:"db_schema_tables"`
 }
 
 // GetObjectsInfo is a structured representation of adbc.GetObjectsSchema
 type GetObjectsInfo struct {
        CatalogName      *string        `json:"catalog_name,omitempty"`
-       CatalogDbSchemas []DBSchemaInfo `json:"catalog_db_schemas,omitempty"`
+       CatalogDbSchemas []DBSchemaInfo `json:"catalog_db_schemas"`
 }
 
 // Scan implements sql.Scanner.
@@ -688,6 +688,7 @@ CATALOGLOOP:
 
        rec := bldr.NewRecord()
        defer rec.Release()
+
        return array.NewRecordReader(adbc.GetObjectsSchema, []arrow.Record{rec})
 }
 
diff --git a/go/adbc/driver/snowflake/connection.go 
b/go/adbc/driver/snowflake/connection.go
index 77d3c2cd5..90ae67f4a 100644
--- a/go/adbc/driver/snowflake/connection.go
+++ b/go/adbc/driver/snowflake/connection.go
@@ -26,6 +26,7 @@ import (
        "io"
        "io/fs"
        "path"
+       "runtime"
        "strconv"
        "strings"
        "time"
@@ -110,6 +111,41 @@ func getQueryID(ctx context.Context, query string, 
driverConn any) (string, erro
        return rows.(gosnowflake.SnowflakeRows).GetQueryID(), rows.Close()
 }
 
+const (
+       objSchemas   = "SCHEMAS"
+       objDatabases = "DATABASES"
+)
+
+func goGetQueryID(ctx context.Context, conn *sql.Conn, grp *errgroup.Group, 
objType string, catalog, dbSchema *string, outQueryID *string) {
+       grp.Go(func() error {
+               return conn.Raw(func(driverConn any) (err error) {
+                       query := "SHOW TERSE /* ADBC:getObjects */ " + objType
+                       switch objType {
+                       case objDatabases:
+                               if catalog != nil && len(*catalog) > 0 && 
*catalog != "%" && *catalog != ".*" {
+                                       query += " LIKE '" + 
escapeSingleQuoteForLike(*catalog) + "'"
+                               }
+                               query += " IN ACCOUNT"
+                       case objSchemas:
+                               if dbSchema != nil && len(*dbSchema) > 0 && 
*dbSchema != "%" && *dbSchema != ".*" {
+                                       query += " LIKE '" + 
escapeSingleQuoteForLike(*dbSchema) + "'"
+                               }
+
+                               if catalog == nil || isWildcardStr(*catalog) {
+                                       query += " IN ACCOUNT"
+                               } else {
+                                       query += " IN DATABASE " + 
quoteTblName(*catalog)
+                               }
+                       default:
+                               return fmt.Errorf("unimplemented object type")
+                       }
+
+                       *outQueryID, err = getQueryID(ctx, query, driverConn)
+                       return
+               })
+       })
+}
+
 func isWildcardStr(ident string) bool {
        return strings.ContainsAny(ident, "_%")
 }
@@ -126,73 +162,84 @@ func (c *connectionImpl) GetObjects(ctx context.Context, 
depth adbc.ObjectDepth,
        }
        defer conn.Close()
 
+       var hasViews, hasTables bool
+       for _, t := range tableType {
+               if strings.EqualFold("VIEW", t) {
+                       hasViews = true
+               } else if strings.EqualFold("TABLE", t) {
+                       hasTables = true
+               }
+       }
+
+       if len(tableType) > 0 && depth >= adbc.ObjectDepthTables && !hasViews 
&& !hasTables {
+               depth = adbc.ObjectDepthDBSchemas
+       }
        gQueryIDs, gQueryIDsCtx := errgroup.WithContext(ctx)
 
        queryFile := queryTemplateGetObjectsAll
        switch depth {
        case adbc.ObjectDepthCatalogs:
                queryFile = queryTemplateGetObjectsTerseCatalogs
-               gQueryIDs.Go(func() error {
-                       return conn.Raw(func(driverConn any) (err error) {
-                               query := "SHOW TERSE /* ADBC:getObjectsCatalogs 
*/ DATABASES"
-                               if catalog != nil && len(*catalog) > 0 && 
*catalog != "%" && *catalog != ".*" {
-                                       query += " LIKE '" + 
escapeSingleQuoteForLike(*catalog) + "'"
-                               }
-                               query += " IN ACCOUNT"
-
-                               terseDbQueryID, err = getQueryID(gQueryIDsCtx, 
query, driverConn)
-                               return
-                       })
-               })
+               goGetQueryID(gQueryIDsCtx, conn, gQueryIDs, objDatabases,
+                       catalog, dbSchema, &terseDbQueryID)
        case adbc.ObjectDepthDBSchemas:
                queryFile = queryTemplateGetObjectsDbSchemas
+               goGetQueryID(gQueryIDsCtx, conn, gQueryIDs, objSchemas,
+                       catalog, dbSchema, &showSchemaQueryID)
+               goGetQueryID(gQueryIDsCtx, conn, gQueryIDs, objDatabases,
+                       catalog, dbSchema, &terseDbQueryID)
+       case adbc.ObjectDepthTables:
+               queryFile = queryTemplateGetObjectsTables
+               goGetQueryID(gQueryIDsCtx, conn, gQueryIDs, objSchemas,
+                       catalog, dbSchema, &showSchemaQueryID)
+               goGetQueryID(gQueryIDsCtx, conn, gQueryIDs, objDatabases,
+                       catalog, dbSchema, &terseDbQueryID)
                gQueryIDs.Go(func() error {
                        return conn.Raw(func(driverConn any) (err error) {
-                               query := "SHOW TERSE /* 
ADBC:getObjectsDBSchemas */ SCHEMAS"
-                               if dbSchema != nil && len(*dbSchema) > 0 && 
*dbSchema != "%" && *dbSchema != ".*" {
-                                       query += " LIKE '" + 
escapeSingleQuoteForLike(*dbSchema) + "'"
+                               objType := "objects"
+                               if len(tableType) == 1 {
+                                       if strings.EqualFold("VIEW", 
tableType[0]) {
+                                               objType = "views"
+                                       } else if strings.EqualFold("TABLE", 
tableType[0]) {
+                                               objType = "tables"
+                                       }
+                               }
+
+                               query := "SHOW TERSE /* ADBC:getObjectsTables 
*/ " + objType
+                               if tableName != nil && len(*tableName) > 0 && 
*tableName != "%" && *tableName != ".*" {
+                                       query += " LIKE '" + 
escapeSingleQuoteForLike(*tableName) + "'"
                                }
                                if catalog == nil || isWildcardStr(*catalog) {
                                        query += " IN ACCOUNT"
                                } else {
-                                       query += " IN DATABASE \"" + 
quoteTblName(*catalog) + "\""
-                               }
-
-                               showSchemaQueryID, err = 
getQueryID(gQueryIDsCtx, query, driverConn)
-                               return
-                       })
-               })
-
-               gQueryIDs.Go(func() error {
-                       return conn.Raw(func(driverConn any) (err error) {
-                               query := "SHOW TERSE /* 
ADBC:getObjectsDBSchemas */ DATABASES"
-                               if catalog != nil && len(*catalog) > 0 && 
*catalog != "%" && *catalog != ".*" {
-                                       query += " LIKE '" + 
escapeSingleQuoteForLike(*catalog) + "'"
+                                       escapedCatalog := quoteTblName(*catalog)
+                                       if dbSchema == nil || 
isWildcardStr(*dbSchema) {
+                                               query += " IN DATABASE " + 
escapedCatalog
+                                       } else {
+                                               query += " IN SCHEMA " + 
escapedCatalog + "." + quoteTblName(*dbSchema)
+                                       }
                                }
-                               query += " IN ACCOUNT"
 
-                               terseDbQueryID, err = getQueryID(gQueryIDsCtx, 
query, driverConn)
+                               tableQueryID, err = getQueryID(gQueryIDsCtx, 
query, driverConn)
                                return
                        })
                })
-       case adbc.ObjectDepthTables:
-               queryFile = queryTemplateGetObjectsTables
-               fallthrough
+               // fallthrough
        default:
                var suffix string
-               if catalog == nil {
+               if catalog == nil || isWildcardStr(*catalog) {
                        suffix = " IN ACCOUNT"
                } else {
                        escapedCatalog := quoteTblName(*catalog)
                        if dbSchema == nil || isWildcardStr(*dbSchema) {
-                               suffix = " IN DATABASE \"" + escapedCatalog + 
"\""
+                               suffix = " IN DATABASE " + escapedCatalog
                        } else {
                                escapedSchema := quoteTblName(*dbSchema)
                                if tableName == nil || 
isWildcardStr(*tableName) {
-                                       suffix = " IN SCHEMA \"" + 
escapedCatalog + "\".\"" + escapedSchema + "\""
+                                       suffix = " IN SCHEMA " + escapedCatalog 
+ "." + escapedSchema
                                } else {
                                        escapedTable := quoteTblName(*tableName)
-                                       suffix = " IN TABLE \"" + 
escapedCatalog + "\".\"" + escapedSchema + "\".\"" + escapedTable + "\""
+                                       suffix = " IN TABLE " + escapedCatalog 
+ "." + escapedSchema + "." + escapedTable
                                }
                        }
                }
@@ -220,35 +267,10 @@ func (c *connectionImpl) GetObjects(ctx context.Context, 
depth adbc.ObjectDepth,
                        })
                })
 
-               gQueryIDs.Go(func() error {
-                       return conn.Raw(func(driverConn any) (err error) {
-                               query := "SHOW TERSE /* 
ADBC:getObjectsDBSchemas */ SCHEMAS"
-                               if dbSchema != nil && len(*dbSchema) > 0 && 
*dbSchema != "%" && *dbSchema != ".*" {
-                                       query += " LIKE '" + 
escapeSingleQuoteForLike(*dbSchema) + "'"
-                               }
-                               if catalog == nil || isWildcardStr(*catalog) {
-                                       query += " IN ACCOUNT"
-                               } else {
-                                       query += " IN DATABASE \"" + 
quoteTblName(*catalog) + "\""
-                               }
-
-                               showSchemaQueryID, err = 
getQueryID(gQueryIDsCtx, query, driverConn)
-                               return
-                       })
-               })
-
-               gQueryIDs.Go(func() error {
-                       return conn.Raw(func(driverConn any) (err error) {
-                               query := "SHOW TERSE /* 
ADBC:getObjectsDBSchemas */ DATABASES"
-                               if catalog != nil && len(*catalog) > 0 && 
*catalog != "%" && *catalog != ".*" {
-                                       query += " LIKE '" + 
escapeSingleQuoteForLike(*catalog) + "'"
-                               }
-                               query += " IN ACCOUNT"
-
-                               terseDbQueryID, err = getQueryID(gQueryIDsCtx, 
query, driverConn)
-                               return
-                       })
-               })
+               goGetQueryID(gQueryIDsCtx, conn, gQueryIDs, objDatabases,
+                       catalog, dbSchema, &terseDbQueryID)
+               goGetQueryID(gQueryIDsCtx, conn, gQueryIDs, objSchemas,
+                       catalog, dbSchema, &showSchemaQueryID)
 
                gQueryIDs.Go(func() error {
                        return conn.Raw(func(driverConn any) (err error) {
@@ -270,9 +292,9 @@ func (c *connectionImpl) GetObjects(ctx context.Context, 
depth adbc.ObjectDepth,
                                } else {
                                        escapedCatalog := quoteTblName(*catalog)
                                        if dbSchema == nil || 
isWildcardStr(*dbSchema) {
-                                               query += " IN DATABASE \"" + 
escapedCatalog + "\""
+                                               query += " IN DATABASE " + 
escapedCatalog
                                        } else {
-                                               query += " IN SCHEMA \"" + 
escapedCatalog + "\".\"" + quoteTblName(*dbSchema) + "\""
+                                               query += " IN SCHEMA " + 
escapedCatalog + "." + quoteTblName(*dbSchema)
                                        }
                                }
 
@@ -340,7 +362,7 @@ func (c *connectionImpl) GetObjects(ctx context.Context, 
depth adbc.ObjectDepth,
        }
        defer rows.Close()
 
-       catalogCh := make(chan driverbase.GetObjectsInfo, 5)
+       catalogCh := make(chan driverbase.GetObjectsInfo, runtime.NumCPU())
        errCh := make(chan error)
 
        go func() {
diff --git a/go/adbc/driver/snowflake/queries/get_objects_all.sql 
b/go/adbc/driver/snowflake/queries/get_objects_all.sql
index 45b807f15..7fc10f2e2 100644
--- a/go/adbc/driver/snowflake/queries/get_objects_all.sql
+++ b/go/adbc/driver/snowflake/queries/get_objects_all.sql
@@ -86,12 +86,12 @@ constraints AS (
         table_catalog,
         table_schema,
         table_name,
-        ARRAY_AGG({
+        ARRAY_AGG(NULLIF({
             'constraint_name': constraint_name,
             'constraint_type': constraint_type,
             'constraint_column_names': constraint_column_names,
             'constraint_column_usage': constraint_column_usage
-        }) table_constraints,
+        }, {})) table_constraints,
     FROM (
         SELECT * FROM pk_constraints
         UNION ALL
@@ -105,12 +105,12 @@ tables AS (
 SELECT
     table_catalog catalog_name,
     table_schema schema_name,
-    ARRAY_AGG({
+    ARRAY_AGG(NULLIF({
         'table_name': table_name,
         'table_type': table_type,
-        'table_columns': table_columns,
-        'table_constraints': table_constraints
-    }) db_schema_tables
+        'table_columns': COALESCE(table_columns, []),
+        'table_constraints': COALESCE(table_constraints, [])
+    }, {})) db_schema_tables
 FROM information_schema.tables
 LEFT JOIN columns
 USING (table_catalog, table_schema, table_name)
@@ -123,7 +123,7 @@ db_schemas AS (
     SELECT
         catalog_name,
         schema_name,
-        db_schema_tables,
+        COALESCE(db_schema_tables, []) db_schema_tables,
     FROM information_schema.schemata
     LEFT JOIN tables
     USING (catalog_name, schema_name)
@@ -132,10 +132,10 @@ db_schemas AS (
 SELECT
     {
         'catalog_name': database_name,
-        'catalog_db_schemas': ARRAY_AGG({
+        'catalog_db_schemas': ARRAY_AGG(NULLIF({
             'db_schema_name': schema_name,
             'db_schema_tables': db_schema_tables
-        })
+        }, {}))
     } get_objects
 FROM
     information_schema.databases
diff --git a/go/adbc/driver/snowflake/queries/get_objects_dbschemas.sql 
b/go/adbc/driver/snowflake/queries/get_objects_dbschemas.sql
index bc454866a..872118f7c 100644
--- a/go/adbc/driver/snowflake/queries/get_objects_dbschemas.sql
+++ b/go/adbc/driver/snowflake/queries/get_objects_dbschemas.sql
@@ -29,10 +29,10 @@ WITH db_schemas AS (
 SELECT
     {
         'catalog_name': "database_name",
-        'catalog_db_schemas': ARRAY_AGG({
+        'catalog_db_schemas': ARRAY_AGG(NULLIF({
             'db_schema_name': "schema_name",
             'db_schema_tables': null
-        })
+        }, {}))
     } get_objects
 FROM
     db_info
diff --git a/go/adbc/driver/snowflake/queries/get_objects_tables.sql 
b/go/adbc/driver/snowflake/queries/get_objects_tables.sql
index ec284947c..9d6ce36ed 100644
--- a/go/adbc/driver/snowflake/queries/get_objects_tables.sql
+++ b/go/adbc/driver/snowflake/queries/get_objects_tables.sql
@@ -15,83 +15,17 @@
 -- specific language governing permissions and limitations
 -- under the License.
 
-WITH pk_constraints AS (
-    SELECT
-        "database_name" "table_catalog",
-        "schema_name" "table_schema",
-        "table_name" "table_name",
-        "constraint_name" "constraint_name",
-        'PRIMARY KEY' "constraint_type",
-        ARRAY_AGG("column_name") WITHIN GROUP (ORDER BY "key_sequence") 
constraint_column_names,
-        [] constraint_column_usage,
-    FROM TABLE(RESULT_SCAN(LAST_QUERY_ID(-4)))
-    WHERE "table_catalog" ILIKE :CATALOG AND "table_schema" ILIKE :DB_SCHEMA 
AND "table_name" ILIKE :TABLE
-    GROUP BY "table_catalog", "table_schema", "table_name", "constraint_name"
-),
-unique_constraints AS (
-    SELECT
-        "database_name" "table_catalog",
-        "schema_name" "table_schema",
-        "table_name" "table_name",
-        "constraint_name" "constraint_name",
-        'UNIQUE' "constraint_type",
-        ARRAY_AGG("column_name") WITHIN GROUP (ORDER BY "key_sequence") 
constraint_column_names,
-        [] constraint_column_usage,
-    FROM TABLE(RESULT_SCAN(:UNIQUE_QUERY_ID))
-    WHERE "table_catalog" ILIKE :CATALOG AND "table_schema" ILIKE :DB_SCHEMA 
AND "table_name" ILIKE :TABLE
-    GROUP BY "table_catalog", "table_schema", "table_name", "constraint_name"
-),
-fk_constraints AS (
-    SELECT
-        "fk_database_name" "table_catalog",
-        "fk_schema_name" "table_schema",
-        "fk_table_name" "table_name",
-        "fk_name" "constraint_name",
-        'FOREIGN KEY' "constraint_type",
-        ARRAY_AGG("fk_column_name") WITHIN GROUP (ORDER BY "key_sequence") 
constraint_column_names,
-        ARRAY_AGG({
-            'fk_catalog': "pk_database_name",
-            'fk_db_schema': "pk_schema_name",
-            'fk_table': "pk_table_name",
-            'fk_column_name': "pk_column_name"
-        }) WITHIN GROUP (ORDER BY "key_sequence") constraint_column_usage,
-    FROM TABLE(RESULT_SCAN(:FK_QUERY_ID))
-    WHERE "table_catalog" ILIKE :CATALOG AND "table_schema" ILIKE :DB_SCHEMA 
AND "table_name" ILIKE :TABLE
-    GROUP BY "table_catalog", "table_schema", "table_name", "constraint_name"
-),
-constraints AS (
-    SELECT
-        "table_catalog",
-        "table_schema",
-        "table_name",
-        ARRAY_AGG({
-            'constraint_name': "constraint_name",
-            'constraint_type': "constraint_type",
-            'constraint_column_names': constraint_column_names,
-            'constraint_column_usage': constraint_column_usage
-        }) table_constraints,
-    FROM (
-        SELECT * FROM pk_constraints
-        UNION ALL
-        SELECT * FROM unique_constraints
-        UNION ALL
-        SELECT * FROM fk_constraints
-    )
-    GROUP BY "table_catalog", "table_schema", "table_name"
-),
-tables AS (
+WITH tables AS (
 SELECT
     "database_name" "catalog_name",
     "schema_name" "schema_name",
     ARRAY_AGG({
         'table_name': "name",
         'table_type': "kind",
-        'table_constraints': table_constraints,
+        'table_constraints': null,
         'table_columns': null
     }) db_schema_tables
 FROM TABLE(RESULT_SCAN(:SHOW_TABLE_QUERY_ID))
-LEFT JOIN constraints
-ON "database_name" = "table_catalog" AND "schema_name" = "table_schema" AND 
"name" = "table_name"
 WHERE "database_name" ILIKE :CATALOG AND "schema_name" ILIKE :DB_SCHEMA AND 
"name" ILIKE :TABLE
 GROUP BY "database_name", "schema_name"
 ),
@@ -99,7 +33,7 @@ db_schemas AS (
     SELECT
         "database_name" "catalog_name",
         "name" "schema_name",
-        db_schema_tables,
+        COALESCE(db_schema_tables, []) db_schema_tables,
     FROM TABLE(RESULT_SCAN(:SHOW_SCHEMA_QUERY_ID))
     LEFT JOIN tables
     ON "database_name" = "catalog_name" AND "name" = tables."schema_name"
@@ -108,10 +42,10 @@ db_schemas AS (
 SELECT
     {
         'catalog_name': "name",
-        'catalog_db_schemas': ARRAY_AGG({
+        'catalog_db_schemas': ARRAY_AGG(NULLIF({
             'db_schema_name': db_schemas."schema_name",
             'db_schema_tables': db_schema_tables
-        })
+        }, {}))
     } get_objects
 FROM
     TABLE(RESULT_SCAN(:SHOW_DB_QUERY_ID))

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