fix: create specific metadata queries for PG (#759)

* fix: create specific metadata queries for PG

Creates specific metadata queries for PostgreSQL dialect databases and
removes the use of the /*GSQL*/ header in the existing metadata queries.

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* fix: linting

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

src/main/java/com/google/cloud/spanner/jdbc/JdbcDatabaseMetaData.java

@@ -19,6 +19,7 @@
 import com.google.auth.Credentials;
 import com.google.auth.ServiceAccountSigner;
 import com.google.auth.oauth2.UserCredentials;
+import com.google.cloud.spanner.Dialect;
 import com.google.cloud.spanner.ResultSets;
 import com.google.cloud.spanner.Struct;
 import com.google.cloud.spanner.Type;
@@ -48,8 +49,16 @@ class JdbcDatabaseMetaData extends AbstractJdbcWrapper implements DatabaseMetaDa
   private static final String PRODUCT_NAME = "Google Cloud Spanner";
 
   @VisibleForTesting
-  static String readSqlFromFile(String filename) {
-    InputStream in = JdbcDatabaseMetaData.class.getResourceAsStream(filename);
+  static String readSqlFromFile(String filename, Dialect dialect) {
+    InputStream in;
+    switch (dialect) {
+      case POSTGRESQL:
+        in = JdbcDatabaseMetaData.class.getResourceAsStream("postgresql/" + filename);
+        break;
+      case GOOGLE_STANDARD_SQL:
+      default:
+        in = JdbcDatabaseMetaData.class.getResourceAsStream(filename);
+    }
     BufferedReader reader = new BufferedReader(new InputStreamReader(in));
     StringBuilder builder = new StringBuilder();
     try (Scanner scanner = new Scanner(reader)) {
@@ -743,7 +752,7 @@ private JdbcPreparedStatement prepareStatementReplaceNullWithAnyString(
   public ResultSet getTables(
       String catalog, String schemaPattern, String tableNamePattern, String[] types)
       throws SQLException {
-    String sql = readSqlFromFile("DatabaseMetaData_GetTables.sql");
+    String sql = readSqlFromFile("DatabaseMetaData_GetTables.sql", connection.getDialect());
     String type1;
     String type2;
     if (types == null || types.length == 0) {
@@ -789,7 +798,7 @@ public ResultSet getTableTypes() {
   public ResultSet getColumns(
       String catalog, String schemaPattern, String tableNamePattern, String columnNamePattern)
       throws SQLException {
-    String sql = readSqlFromFile("DatabaseMetaData_GetColumns.sql");
+    String sql = readSqlFromFile("DatabaseMetaData_GetColumns.sql", connection.getDialect());
     JdbcPreparedStatement statement =
         prepareStatementReplaceNullWithAnyString(
             sql, catalog, schemaPattern, tableNamePattern, columnNamePattern);
@@ -858,7 +867,7 @@ private ResultSet getEmptyColumnsResultSet() {
   @Override
   public ResultSet getPrimaryKeys(String catalog, String schema, String table) throws SQLException {
     JdbcPreconditions.checkArgument(table != null, "table may not be null");
-    String sql = readSqlFromFile("DatabaseMetaData_GetPrimaryKeys.sql");
+    String sql = readSqlFromFile("DatabaseMetaData_GetPrimaryKeys.sql", connection.getDialect());
     JdbcPreparedStatement statement =
         prepareStatementReplaceNullWithAnyString(sql, catalog, schema, table);
     return statement.executeQueryWithOptions(InternalMetadataQuery.INSTANCE);
@@ -868,7 +877,7 @@ public ResultSet getPrimaryKeys(String catalog, String schema, String table) thr
   public ResultSet getImportedKeys(String catalog, String schema, String table)
       throws SQLException {
     JdbcPreconditions.checkArgument(table != null, "table may not be null");
-    String sql = readSqlFromFile("DatabaseMetaData_GetImportedKeys.sql");
+    String sql = readSqlFromFile("DatabaseMetaData_GetImportedKeys.sql", connection.getDialect());
     JdbcPreparedStatement statement =
         prepareStatementReplaceNullWithAnyString(sql, catalog, schema, table);
     return statement.executeQueryWithOptions(InternalMetadataQuery.INSTANCE);
@@ -878,7 +887,7 @@ public ResultSet getImportedKeys(String catalog, String schema, String table)
   public ResultSet getExportedKeys(String catalog, String schema, String table)
       throws SQLException {
     JdbcPreconditions.checkArgument(table != null, "table may not be null");
-    String sql = readSqlFromFile("DatabaseMetaData_GetExportedKeys.sql");
+    String sql = readSqlFromFile("DatabaseMetaData_GetExportedKeys.sql", connection.getDialect());
     JdbcPreparedStatement statement =
         prepareStatementReplaceNullWithAnyString(sql, catalog, schema, table);
     return statement.executeQueryWithOptions(InternalMetadataQuery.INSTANCE);
@@ -893,7 +902,8 @@ public ResultSet getCrossReference(
       String foreignSchema,
       String foreignTable)
       throws SQLException {
-    String sql = readSqlFromFile("DatabaseMetaData_GetCrossReferences.sql");
+    String sql =
+        readSqlFromFile("DatabaseMetaData_GetCrossReferences.sql", connection.getDialect());
     JdbcPreparedStatement statement =
         prepareStatementReplaceNullWithAnyString(
             sql,
@@ -1251,7 +1261,7 @@ public ResultSet getIndexInfo(String catalog, String schema, String indexName)
   private ResultSet getIndexInfo(
       String catalog, String schema, String table, String indexName, boolean unique)
       throws SQLException {
-    String sql = readSqlFromFile("DatabaseMetaData_GetIndexInfo.sql");
+    String sql = readSqlFromFile("DatabaseMetaData_GetIndexInfo.sql", connection.getDialect());
     JdbcPreparedStatement statement =
         prepareStatementReplaceNullWithAnyString(
             sql, catalog, schema, table, indexName, unique ? "YES" : "%");
@@ -1467,7 +1477,7 @@ public RowIdLifetime getRowIdLifetime() {
 
   @Override
   public ResultSet getSchemas(String catalog, String schemaPattern) throws SQLException {
-    String sql = readSqlFromFile("DatabaseMetaData_GetSchemas.sql");
+    String sql = readSqlFromFile("DatabaseMetaData_GetSchemas.sql", connection.getDialect());
     JdbcPreparedStatement statement =
         prepareStatementReplaceNullWithAnyString(sql, catalog, schemaPattern);
     return statement.executeQueryWithOptions(InternalMetadataQuery.INSTANCE);

src/main/resources/com/google/cloud/spanner/jdbc/DatabaseMetaData_GetColumns.sql

@@ -1,4 +1,3 @@
-/*GSQL*/
 /*
  * Copyright 2019 Google LLC
  *

src/main/resources/com/google/cloud/spanner/jdbc/DatabaseMetaData_GetCrossReferences.sql

@@ -1,4 +1,3 @@
-/*GSQL*/
 /*
  * Copyright 2019 Google LLC
  *

src/main/resources/com/google/cloud/spanner/jdbc/DatabaseMetaData_GetExportedKeys.sql

@@ -1,4 +1,3 @@
-/*GSQL*/
 /*
  * Copyright 2019 Google LLC
  *

src/main/resources/com/google/cloud/spanner/jdbc/DatabaseMetaData_GetImportedKeys.sql

@@ -1,4 +1,3 @@
-/*GSQL*/
 /*
  * Copyright 2019 Google LLC
  *

src/main/resources/com/google/cloud/spanner/jdbc/DatabaseMetaData_GetIndexInfo.sql

@@ -1,4 +1,3 @@
-/*GSQL*/
 /*
  * Copyright 2019 Google LLC
  *

src/main/resources/com/google/cloud/spanner/jdbc/DatabaseMetaData_GetPrimaryKeys.sql

@@ -1,4 +1,3 @@
-/*GSQL*/
 /*
  * Copyright 2019 Google LLC
  *

src/main/resources/com/google/cloud/spanner/jdbc/DatabaseMetaData_GetSchemas.sql

@@ -1,4 +1,3 @@
-/*GSQL*/
 /*
  * Copyright 2019 Google LLC
  *

src/main/resources/com/google/cloud/spanner/jdbc/DatabaseMetaData_GetTables.sql

@@ -1,4 +1,3 @@
-/*GSQL*/
 /*
  * Copyright 2019 Google LLC
  *

src/main/resources/com/google/cloud/spanner/jdbc/postgresql/DatabaseMetaData_GetColumns.sql

@@ -0,0 +1,81 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+SELECT TABLE_CATALOG AS "TABLE_CAT", TABLE_SCHEMA AS "TABLE_SCHEM", TABLE_NAME AS "TABLE_NAME", COLUMN_NAME AS "COLUMN_NAME",
+       CASE
+           WHEN DATA_TYPE LIKE 'ARRAY' THEN 2003
+           WHEN DATA_TYPE = 'boolean' THEN 16
+           WHEN DATA_TYPE LIKE 'bytea' THEN -2
+           WHEN DATA_TYPE = 'date' THEN 91
+           WHEN DATA_TYPE = 'double precision' THEN 8
+           WHEN DATA_TYPE = 'bigint' THEN -5
+           WHEN DATA_TYPE = 'numeric' THEN 2
+           WHEN DATA_TYPE LIKE 'character varying' THEN -9
+           WHEN DATA_TYPE = 'jsonb' THEN -9
+           WHEN DATA_TYPE = 'timestamp with time zone' THEN 93
+           END AS "DATA_TYPE",
+       DATA_TYPE AS "TYPE_NAME",
+       CASE
+           WHEN DATA_TYPE LIKE 'ARRAY' THEN 0
+           WHEN DATA_TYPE = 'boolean' THEN NULL
+           WHEN DATA_TYPE LIKE 'bytea' THEN 10485760
+           WHEN DATA_TYPE = 'date' THEN 10
+           WHEN DATA_TYPE = 'double precision' THEN 15
+           WHEN DATA_TYPE = 'bigint' THEN 19
+           WHEN DATA_TYPE = 'numeric' THEN 15
+           WHEN DATA_TYPE LIKE 'character varying' THEN CHARACTER_MAXIMUM_LENGTH
+           WHEN DATA_TYPE = 'jsonb' THEN 2621440
+           WHEN DATA_TYPE = 'timestamp with time zone' THEN 35
+           END AS "COLUMN_SIZE",
+       0 AS "BUFFER_LENGTH",
+       CASE
+           WHEN DATA_TYPE LIKE 'double precision' THEN 16
+           WHEN DATA_TYPE LIKE 'numeric' THEN 16383
+           ELSE NULL
+           END AS "DECIMAL_DIGITS",
+       CASE
+           WHEN DATA_TYPE LIKE 'bigint' THEN 10
+           WHEN DATA_TYPE LIKE 'numeric' THEN 10
+           WHEN DATA_TYPE LIKE 'double precision' THEN 2
+           ELSE NULL
+           END AS "NUM_PREC_RADIX",
+       CASE
+           WHEN IS_NULLABLE = 'YES' THEN 1
+           WHEN IS_NULLABLE = 'NO' THEN 0
+           ELSE 2
+           END AS "NULLABLE",
+       NULL AS "REMARKS",
+       NULL AS "COLUMN_DEF",
+       0 AS "SQL_DATA_TYPE",
+       0 AS "SQL_DATETIME_SUB",
+       CHARACTER_MAXIMUM_LENGTH AS "CHAR_OCTET_LENGTH",
+       ORDINAL_POSITION AS "ORDINAL_POSITION",
+       IS_NULLABLE AS "IS_NULLABLE",
+       NULL AS "SCOPE_CATALOG",
+       NULL AS "SCOPE_SCHEMA",
+       NULL AS "SCOPE_TABLE",
+       NULL AS "SOURCE_DATA_TYPE",
+       'NO' AS "IS_AUTOINCREMENT",
+       CASE
+           WHEN (IS_GENERATED = 'NEVER') THEN 'NO'
+           ELSE 'YES'
+        END AS "IS_GENERATEDCOLUMN"
+FROM INFORMATION_SCHEMA.COLUMNS C
+WHERE UPPER(C.TABLE_CATALOG) LIKE ?
+  AND UPPER(C.TABLE_SCHEMA) LIKE ?
+  AND UPPER(C.TABLE_NAME) LIKE ?
+  AND UPPER(C.COLUMN_NAME) LIKE ?
+ORDER BY TABLE_CATALOG, TABLE_SCHEMA, TABLE_NAME, ORDINAL_POSITION

src/main/resources/com/google/cloud/spanner/jdbc/postgresql/DatabaseMetaData_GetCrossReferences.sql

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+SELECT	PARENT.TABLE_CATALOG AS "PKTABLE_CAT", PARENT.TABLE_SCHEMA AS "PKTABLE_SCHEM", PARENT.TABLE_NAME AS "PKTABLE_NAME",
+          PARENT.COLUMN_NAME AS "PKCOLUMN_NAME", CHILD.TABLE_CATALOG AS "FKTABLE_CAT", CHILD.TABLE_SCHEMA AS "FKTABLE_SCHEM",
+          CHILD.TABLE_NAME AS "FKTABLE_NAME", CHILD.COLUMN_NAME AS "FKCOLUMN_NAME", CHILD.ORDINAL_POSITION AS "KEY_SEQ", 3 AS "UPDATE_RULE",
+          3 AS "DELETE_RULE", CONSTRAINTS.CONSTRAINT_NAME AS "FK_NAME", CONSTRAINTS.UNIQUE_CONSTRAINT_NAME AS "PK_NAME",
+          7 AS "DEFERRABILITY"
+FROM INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS CONSTRAINTS
+         INNER JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE CHILD  ON CONSTRAINTS.CONSTRAINT_CATALOG=CHILD.CONSTRAINT_CATALOG AND CONSTRAINTS.CONSTRAINT_SCHEMA= CHILD.CONSTRAINT_SCHEMA AND CONSTRAINTS.CONSTRAINT_NAME= CHILD.CONSTRAINT_NAME
+         INNER JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE PARENT ON CONSTRAINTS.UNIQUE_CONSTRAINT_CATALOG=PARENT.CONSTRAINT_CATALOG AND CONSTRAINTS.UNIQUE_CONSTRAINT_SCHEMA=PARENT.CONSTRAINT_SCHEMA AND CONSTRAINTS.UNIQUE_CONSTRAINT_NAME=PARENT.CONSTRAINT_NAME AND PARENT.ORDINAL_POSITION=CHILD.POSITION_IN_UNIQUE_CONSTRAINT
+WHERE UPPER(PARENT.TABLE_CATALOG) LIKE ?
+  AND UPPER(PARENT.TABLE_SCHEMA) LIKE ?
+  AND UPPER(PARENT.TABLE_NAME) LIKE ?
+  AND UPPER(CHILD.TABLE_CATALOG) LIKE ?
+  AND UPPER(CHILD.TABLE_SCHEMA) LIKE ?
+  AND UPPER(CHILD.TABLE_NAME) LIKE ?
+ORDER BY CHILD.TABLE_CATALOG, CHILD.TABLE_SCHEMA, CHILD.TABLE_NAME, CHILD.ORDINAL_POSITION

src/main/resources/com/google/cloud/spanner/jdbc/postgresql/DatabaseMetaData_GetExportedKeys.sql

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+SELECT	PARENT.TABLE_CATALOG AS "PKTABLE_CAT", PARENT.TABLE_SCHEMA AS "PKTABLE_SCHEM", PARENT.TABLE_NAME AS "PKTABLE_NAME",
+          PARENT.COLUMN_NAME AS "PKCOLUMN_NAME", CHILD.TABLE_CATALOG AS "FKTABLE_CAT", CHILD.TABLE_SCHEMA AS "FKTABLE_SCHEM",
+          CHILD.TABLE_NAME AS "FKTABLE_NAME", CHILD.COLUMN_NAME AS "FKCOLUMN_NAME",
+          CHILD.ORDINAL_POSITION AS "KEY_SEQ",
+          1 AS "UPDATE_RULE", -- 1 = importedKeyRestrict
+          1 AS "DELETE_RULE", -- 1 = importedKeyRestrict
+          CONSTRAINTS.CONSTRAINT_NAME AS "FK_NAME", CONSTRAINTS.UNIQUE_CONSTRAINT_NAME AS "PK_NAME",
+          7 AS "DEFERRABILITY" -- 7 = importedKeyNotDeferrable
+FROM INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS CONSTRAINTS
+         INNER JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE CHILD  ON CONSTRAINTS.CONSTRAINT_CATALOG=CHILD.CONSTRAINT_CATALOG AND CONSTRAINTS.CONSTRAINT_SCHEMA= CHILD.CONSTRAINT_SCHEMA AND CONSTRAINTS.CONSTRAINT_NAME= CHILD.CONSTRAINT_NAME
+         INNER JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE PARENT ON CONSTRAINTS.UNIQUE_CONSTRAINT_CATALOG=PARENT.CONSTRAINT_CATALOG AND CONSTRAINTS.UNIQUE_CONSTRAINT_SCHEMA=PARENT.CONSTRAINT_SCHEMA AND CONSTRAINTS.UNIQUE_CONSTRAINT_NAME=PARENT.CONSTRAINT_NAME AND PARENT.ORDINAL_POSITION=CHILD.POSITION_IN_UNIQUE_CONSTRAINT
+WHERE UPPER(PARENT.TABLE_CATALOG) LIKE ?
+  AND UPPER(PARENT.TABLE_SCHEMA) LIKE ?
+  AND UPPER(PARENT.TABLE_NAME) LIKE ?
+ORDER BY CHILD.TABLE_CATALOG, CHILD.TABLE_SCHEMA, CHILD.TABLE_NAME, CHILD.ORDINAL_POSITION

src/main/resources/com/google/cloud/spanner/jdbc/postgresql/DatabaseMetaData_GetImportedKeys.sql

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+SELECT	PARENT.TABLE_CATALOG AS "PKTABLE_CAT", PARENT.TABLE_SCHEMA AS "PKTABLE_SCHEM", PARENT.TABLE_NAME AS "PKTABLE_NAME",
+          PARENT.COLUMN_NAME AS "PKCOLUMN_NAME", CHILD.TABLE_CATALOG AS "FKTABLE_CAT", CHILD.TABLE_SCHEMA AS "FKTABLE_SCHEM",
+          CHILD.TABLE_NAME AS "FKTABLE_NAME", CHILD.COLUMN_NAME AS "FKCOLUMN_NAME",
+          CHILD.ORDINAL_POSITION AS "KEY_SEQ",
+          1 AS "UPDATE_RULE", -- 1 = importedKeyRestrict
+          1 AS "DELETE_RULE", -- 1 = importedKeyRestrict
+          CONSTRAINTS.CONSTRAINT_NAME AS "FK_NAME", CONSTRAINTS.UNIQUE_CONSTRAINT_NAME AS "PK_NAME",
+          7 AS "DEFERRABILITY" -- 7 = importedKeyNotDeferrable
+FROM INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS CONSTRAINTS
+         INNER JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE CHILD  ON CONSTRAINTS.CONSTRAINT_CATALOG=CHILD.CONSTRAINT_CATALOG AND CONSTRAINTS.CONSTRAINT_SCHEMA= CHILD.CONSTRAINT_SCHEMA AND CONSTRAINTS.CONSTRAINT_NAME= CHILD.CONSTRAINT_NAME
+         INNER JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE PARENT ON CONSTRAINTS.UNIQUE_CONSTRAINT_CATALOG=PARENT.CONSTRAINT_CATALOG AND CONSTRAINTS.UNIQUE_CONSTRAINT_SCHEMA=PARENT.CONSTRAINT_SCHEMA AND CONSTRAINTS.UNIQUE_CONSTRAINT_NAME=PARENT.CONSTRAINT_NAME AND PARENT.ORDINAL_POSITION=CHILD.POSITION_IN_UNIQUE_CONSTRAINT
+WHERE UPPER(CHILD.TABLE_CATALOG) LIKE ?
+  AND UPPER(CHILD.TABLE_SCHEMA) LIKE ?
+  AND UPPER(CHILD.TABLE_NAME) LIKE ?
+ORDER BY PARENT.TABLE_CATALOG, PARENT.TABLE_SCHEMA, PARENT.TABLE_NAME, CHILD.ORDINAL_POSITION

src/main/resources/com/google/cloud/spanner/jdbc/postgresql/DatabaseMetaData_GetIndexInfo.sql

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+SELECT IDX.TABLE_CATALOG AS "TABLE_CAT", IDX.TABLE_SCHEMA AS "TABLE_SCHEM", IDX.TABLE_NAME AS "TABLE_NAME",
+       CASE WHEN IS_UNIQUE='YES' THEN FALSE ELSE TRUE END AS "NON_UNIQUE",
+       IDX.TABLE_CATALOG AS "INDEX_QUALIFIER", IDX.INDEX_NAME AS "INDEX_NAME",
+       2 AS "TYPE",
+       ORDINAL_POSITION AS "ORDINAL_POSITION", COLUMN_NAME AS "COLUMN_NAME", SUBSTR(COLUMN_ORDERING, 1, 1) AS "ASC_OR_DESC",
+       -1 AS "CARDINALITY", -- Not supported
+       -1 AS "PAGES", -- Not supported
+       NULL AS "FILTER_CONDITION"
+FROM INFORMATION_SCHEMA.INDEXES IDX
+INNER JOIN INFORMATION_SCHEMA.INDEX_COLUMNS COL
+            ON  IDX.TABLE_CATALOG=COL.TABLE_CATALOG
+                AND IDX.TABLE_SCHEMA=COL.TABLE_SCHEMA
+                AND IDX.TABLE_NAME=COL.TABLE_NAME
+                AND IDX.INDEX_NAME=COL.INDEX_NAME
+WHERE UPPER(IDX.TABLE_CATALOG) LIKE ?
+  AND UPPER(IDX.TABLE_SCHEMA) LIKE ?
+  AND UPPER(IDX.TABLE_NAME) LIKE ?
+  AND UPPER(IDX.INDEX_NAME) LIKE ?
+  AND UPPER(IS_UNIQUE) LIKE ?
+ORDER BY IDX.TABLE_NAME, IS_UNIQUE DESC, IDX.INDEX_NAME, CASE WHEN ORDINAL_POSITION IS NULL THEN 0 ELSE ORDINAL_POSITION END

src/main/resources/com/google/cloud/spanner/jdbc/postgresql/DatabaseMetaData_GetPrimaryKeys.sql

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+SELECT IDX.TABLE_CATALOG AS "TABLE_CAT", IDX.TABLE_SCHEMA AS "TABLE_SCHEM", IDX.TABLE_NAME AS "TABLE_NAME",
+       COLS.COLUMN_NAME AS "COLUMN_NAME", ORDINAL_POSITION AS "KEY_SEQ", IDX.INDEX_NAME AS "PK_NAME"
+FROM INFORMATION_SCHEMA.INDEXES IDX
+INNER JOIN INFORMATION_SCHEMA.INDEX_COLUMNS COLS
+            ON  IDX.TABLE_CATALOG=COLS.TABLE_CATALOG
+                AND IDX.TABLE_SCHEMA=COLS.TABLE_SCHEMA
+                AND IDX.TABLE_NAME=COLS.TABLE_NAME
+                AND IDX.INDEX_NAME=COLS.INDEX_NAME
+WHERE IDX.INDEX_TYPE='PRIMARY_KEY'
+  AND UPPER(IDX.TABLE_CATALOG) LIKE ?
+  AND UPPER(IDX.TABLE_SCHEMA) LIKE ?
+  AND UPPER(IDX.TABLE_NAME) LIKE ?
+ORDER BY COLS.ORDINAL_POSITION