src/main/user-impl/java/com/mysql/cj/jdbc/DatabaseMetaDataUsingInfoSchema.java [357:380]:
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        if (table == null) {
            throw SQLError.createSQLException(Messages.getString("DatabaseMetaData.2"), MysqlErrorNumbers.SQL_STATE_ILLEGAL_ARGUMENT,
                    getExceptionInterceptor());
        }

        String db = getDatabase(catalog, schema);

        db = this.pedantic ? db : StringUtils.unQuoteIdentifier(db, this.quotedId);

        StringBuilder sqlBuf = new StringBuilder(
                this.databaseTerm.getValue() == DatabaseTerm.SCHEMA ? "SELECT A.CONSTRAINT_CATALOG AS PKTABLE_CAT, A.REFERENCED_TABLE_SCHEMA AS PKTABLE_SCHEM,"
                        : "SELECT A.REFERENCED_TABLE_SCHEMA AS PKTABLE_CAT,NULL AS PKTABLE_SCHEM,");
        sqlBuf.append(" A.REFERENCED_TABLE_NAME AS PKTABLE_NAME, A.REFERENCED_COLUMN_NAME AS PKCOLUMN_NAME,");
        sqlBuf.append(this.databaseTerm.getValue() == DatabaseTerm.SCHEMA ? " A.TABLE_CATALOG AS FKTABLE_CAT, A.TABLE_SCHEMA AS FKTABLE_SCHEM,"
                : " A.TABLE_SCHEMA AS FKTABLE_CAT, NULL AS FKTABLE_SCHEM,");
        sqlBuf.append(" A.TABLE_NAME AS FKTABLE_NAME, A.COLUMN_NAME AS FKCOLUMN_NAME, A.ORDINAL_POSITION AS KEY_SEQ,");
        sqlBuf.append(generateUpdateRuleClause());
        sqlBuf.append(" AS UPDATE_RULE,");
        sqlBuf.append(generateDeleteRuleClause());
        sqlBuf.append(" AS DELETE_RULE, A.CONSTRAINT_NAME AS FK_NAME, (SELECT CONSTRAINT_NAME FROM");
        sqlBuf.append(" INFORMATION_SCHEMA.TABLE_CONSTRAINTS WHERE TABLE_SCHEMA = A.REFERENCED_TABLE_SCHEMA AND");
        sqlBuf.append(" TABLE_NAME = A.REFERENCED_TABLE_NAME AND CONSTRAINT_TYPE IN ('UNIQUE','PRIMARY KEY') LIMIT 1) AS PK_NAME,");
        sqlBuf.append(importedKeyNotDeferrable);
        sqlBuf.append(" AS DEFERRABILITY FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE A");
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src/main/user-impl/java/com/mysql/cj/jdbc/DatabaseMetaDataUsingInfoSchema.java [435:458]:
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        if (table == null) {
            throw SQLError.createSQLException(Messages.getString("DatabaseMetaData.2"), MysqlErrorNumbers.SQL_STATE_ILLEGAL_ARGUMENT,
                    getExceptionInterceptor());
        }

        String db = getDatabase(catalog, schema);

        db = this.pedantic ? db : StringUtils.unQuoteIdentifier(db, this.quotedId);

        StringBuilder sqlBuf = new StringBuilder(
                this.databaseTerm.getValue() == DatabaseTerm.SCHEMA ? "SELECT A.CONSTRAINT_CATALOG AS PKTABLE_CAT, A.REFERENCED_TABLE_SCHEMA AS PKTABLE_SCHEM,"
                        : "SELECT A.REFERENCED_TABLE_SCHEMA AS PKTABLE_CAT,NULL AS PKTABLE_SCHEM,");
        sqlBuf.append(" A.REFERENCED_TABLE_NAME AS PKTABLE_NAME, A.REFERENCED_COLUMN_NAME AS PKCOLUMN_NAME,");
        sqlBuf.append(this.databaseTerm.getValue() == DatabaseTerm.SCHEMA ? " A.TABLE_CATALOG AS FKTABLE_CAT, A.TABLE_SCHEMA AS FKTABLE_SCHEM,"
                : " A.TABLE_SCHEMA AS FKTABLE_CAT, NULL AS FKTABLE_SCHEM,");
        sqlBuf.append(" A.TABLE_NAME AS FKTABLE_NAME, A.COLUMN_NAME AS FKCOLUMN_NAME, A.ORDINAL_POSITION AS KEY_SEQ,");
        sqlBuf.append(generateUpdateRuleClause());
        sqlBuf.append(" AS UPDATE_RULE,");
        sqlBuf.append(generateDeleteRuleClause());
        sqlBuf.append(" AS DELETE_RULE, A.CONSTRAINT_NAME AS FK_NAME, (SELECT CONSTRAINT_NAME FROM");
        sqlBuf.append(" INFORMATION_SCHEMA.TABLE_CONSTRAINTS WHERE TABLE_SCHEMA = A.REFERENCED_TABLE_SCHEMA AND");
        sqlBuf.append(" TABLE_NAME = A.REFERENCED_TABLE_NAME AND CONSTRAINT_TYPE IN ('UNIQUE','PRIMARY KEY') LIMIT 1) AS PK_NAME,");
        sqlBuf.append(importedKeyNotDeferrable);
        sqlBuf.append(" AS DEFERRABILITY FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE A");
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