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/*
* Copyright 2021 Hazelcast Inc.
*
* Licensed under the Hazelcast Community License (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://hazelcast.com/hazelcast-community-license
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hazelcast.jet.sql.impl.validate;
import com.hazelcast.jet.sql.impl.parse.SqlAlterJob;
import com.hazelcast.jet.sql.impl.parse.SqlCreateJob;
import com.hazelcast.jet.sql.impl.parse.SqlCreateSnapshot;
import com.hazelcast.jet.sql.impl.parse.SqlDropJob;
import com.hazelcast.jet.sql.impl.parse.SqlDropSnapshot;
import com.hazelcast.jet.sql.impl.parse.SqlOption;
import com.hazelcast.jet.sql.impl.parse.SqlShowStatement;
import com.hazelcast.jet.sql.impl.schema.HazelcastDynamicTableFunction;
import com.hazelcast.jet.sql.impl.validate.types.HazelcastTypeUtils;
import com.hazelcast.org.apache.calcite.runtime.CalciteContextException;
import com.hazelcast.org.apache.calcite.runtime.Resources.ExInst;
import com.hazelcast.org.apache.calcite.sql.JoinConditionType;
import com.hazelcast.org.apache.calcite.sql.JoinType;
import com.hazelcast.org.apache.calcite.sql.SqlBasicTypeNameSpec;
import com.hazelcast.org.apache.calcite.sql.SqlCall;
import com.hazelcast.org.apache.calcite.sql.SqlDataTypeSpec;
import com.hazelcast.org.apache.calcite.sql.SqlIdentifier;
import com.hazelcast.org.apache.calcite.sql.SqlJoin;
import com.hazelcast.org.apache.calcite.sql.SqlJsonConstructorNullClause;
import com.hazelcast.org.apache.calcite.sql.SqlJsonEmptyOrError;
import com.hazelcast.org.apache.calcite.sql.SqlJsonQueryEmptyOrErrorBehavior;
import com.hazelcast.org.apache.calcite.sql.SqlJsonQueryWrapperBehavior;
import com.hazelcast.org.apache.calcite.sql.SqlJsonValueEmptyOrErrorBehavior;
import com.hazelcast.org.apache.calcite.sql.SqlJsonValueReturning;
import com.hazelcast.org.apache.calcite.sql.SqlKind;
import com.hazelcast.org.apache.calcite.sql.SqlLiteral;
import com.hazelcast.org.apache.calcite.sql.SqlNode;
import com.hazelcast.org.apache.calcite.sql.SqlOperator;
import com.hazelcast.org.apache.calcite.sql.SqlSelect;
import com.hazelcast.org.apache.calcite.sql.SqlSelectKeyword;
import com.hazelcast.org.apache.calcite.sql.SqlUserDefinedTypeNameSpec;
import com.hazelcast.org.apache.calcite.sql.SqlUtil;
import com.hazelcast.org.apache.calcite.sql.fun.SqlStdOperatorTable;
import com.hazelcast.org.apache.calcite.sql.fun.SqlTrimFunction;
import com.hazelcast.org.apache.calcite.sql.type.SqlTypeName;
import com.hazelcast.org.apache.calcite.sql.util.SqlBasicVisitor;
import com.hazelcast.org.apache.calcite.sql.validate.SqlValidatorException;
import java.util.HashSet;
import java.util.Set;
import static com.hazelcast.jet.sql.impl.validate.ValidatorResource.RESOURCE;
/**
* Visitor that throws exceptions for unsupported SQL features.
*/
@SuppressWarnings("checkstyle:ExecutableStatementCount")
public final class UnsupportedOperationVisitor extends SqlBasicVisitor {
/**
* A set of {@link SqlKind} values that are supported without any additional validation.
*/
private static final Set SUPPORTED_KINDS;
/**
* A set of supported operators for functions.
*/
private static final Set SUPPORTED_OPERATORS;
/**
* A set of supported parser symbols.
*/
private static final Set> SUPPORTED_SYMBOLS;
static {
// We define all supported features explicitly instead of getting them from predefined sets of SqlKind class.
// This is needed to ensure that we do not miss any unsupported features when something is added to a new version
// of Apache Calcite.
SUPPORTED_KINDS = new HashSet<>();
// Predicates
SUPPORTED_KINDS.add(SqlKind.AND);
SUPPORTED_KINDS.add(SqlKind.OR);
SUPPORTED_KINDS.add(SqlKind.NOT);
SUPPORTED_KINDS.add(SqlKind.IN);
SUPPORTED_KINDS.add(SqlKind.NOT_IN);
SUPPORTED_KINDS.add(SqlKind.BETWEEN);
SUPPORTED_KINDS.add(SqlKind.EXISTS);
// Arithmetics
SUPPORTED_KINDS.add(SqlKind.PLUS);
SUPPORTED_KINDS.add(SqlKind.MINUS);
SUPPORTED_KINDS.add(SqlKind.TIMES);
SUPPORTED_KINDS.add(SqlKind.DIVIDE);
SUPPORTED_KINDS.add(SqlKind.MOD);
SUPPORTED_KINDS.add(SqlKind.MINUS_PREFIX);
SUPPORTED_KINDS.add(SqlKind.PLUS_PREFIX);
// "IS" predicates
SUPPORTED_KINDS.add(SqlKind.IS_TRUE);
SUPPORTED_KINDS.add(SqlKind.IS_NOT_TRUE);
SUPPORTED_KINDS.add(SqlKind.IS_FALSE);
SUPPORTED_KINDS.add(SqlKind.IS_NOT_FALSE);
SUPPORTED_KINDS.add(SqlKind.IS_NULL);
SUPPORTED_KINDS.add(SqlKind.IS_NOT_NULL);
// Comparison predicates
SUPPORTED_KINDS.add(SqlKind.EQUALS);
SUPPORTED_KINDS.add(SqlKind.NOT_EQUALS);
SUPPORTED_KINDS.add(SqlKind.LESS_THAN);
SUPPORTED_KINDS.add(SqlKind.GREATER_THAN);
SUPPORTED_KINDS.add(SqlKind.GREATER_THAN_OR_EQUAL);
SUPPORTED_KINDS.add(SqlKind.LESS_THAN_OR_EQUAL);
// Miscellaneous
SUPPORTED_KINDS.add(SqlKind.AS);
SUPPORTED_KINDS.add(SqlKind.CAST);
SUPPORTED_KINDS.add(SqlKind.CEIL);
SUPPORTED_KINDS.add(SqlKind.FLOOR);
SUPPORTED_KINDS.add(SqlKind.LIKE);
SUPPORTED_KINDS.add(SqlKind.TRIM);
SUPPORTED_KINDS.add(SqlKind.CASE);
SUPPORTED_KINDS.add(SqlKind.NULLIF);
SUPPORTED_KINDS.add(SqlKind.COALESCE);
SUPPORTED_KINDS.add(SqlKind.UNION);
SUPPORTED_KINDS.add(SqlKind.EXPLAIN);
// Aggregations
SUPPORTED_KINDS.add(SqlKind.COUNT);
SUPPORTED_KINDS.add(SqlKind.MIN);
SUPPORTED_KINDS.add(SqlKind.MAX);
SUPPORTED_KINDS.add(SqlKind.SUM);
SUPPORTED_KINDS.add(SqlKind.AVG);
// DDL & DML
SUPPORTED_KINDS.add(SqlKind.CREATE_TABLE);
SUPPORTED_KINDS.add(SqlKind.CREATE_VIEW);
SUPPORTED_KINDS.add(SqlKind.DROP_TABLE);
SUPPORTED_KINDS.add(SqlKind.CREATE_INDEX);
SUPPORTED_KINDS.add(SqlKind.DROP_VIEW);
SUPPORTED_KINDS.add(SqlKind.COLUMN_DECL);
SUPPORTED_KINDS.add(SqlKind.CREATE_TYPE);
SUPPORTED_KINDS.add(SqlKind.DROP_TYPE);
SUPPORTED_KINDS.add(SqlKind.ROW);
SUPPORTED_KINDS.add(SqlKind.VALUES);
SUPPORTED_KINDS.add(SqlKind.INSERT);
// Table functions
SUPPORTED_KINDS.add(SqlKind.COLLECTION_TABLE);
SUPPORTED_KINDS.add(SqlKind.ARGUMENT_ASSIGNMENT);
SUPPORTED_KINDS.add(SqlKind.DESCRIPTOR);
// Ordering
SUPPORTED_KINDS.add(SqlKind.DESCENDING);
SUPPORTED_KINDS.add(SqlKind.JSON_ARRAYAGG);
SUPPORTED_KINDS.add(SqlKind.JSON_OBJECTAGG);
SUPPORTED_KINDS.add(SqlKind.WITHIN_GROUP);
// Nested Fields
SUPPORTED_KINDS.add(SqlKind.DOT);
// Supported operators
SUPPORTED_OPERATORS = new HashSet<>();
// Math
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.POWER);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.SQUARE);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.SQRT);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.CBRT);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.COS);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.SIN);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.TAN);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.COT);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.ACOS);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.ASIN);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.ATAN);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.ATAN2);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.EXP);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.LN);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.LOG10);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.RAND);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.ABS);
SUPPORTED_OPERATORS.add(SqlStdOperatorTable.PI);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.SIGN);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.DEGREES);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.RADIANS);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.ROUND);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.TRUNCATE);
// Strings
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.ASCII);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.INITCAP);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.CHAR_LENGTH);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.CHARACTER_LENGTH);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.LENGTH);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.LOWER);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.UPPER);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.CONCAT);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.CONCAT_WS);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.SUBSTRING);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.LTRIM);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.RTRIM);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.BTRIM);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.REPLACE);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.POSITION);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.NOT_LIKE);
// Datetime
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.EXTRACT);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.TO_TIMESTAMP_TZ);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.TO_EPOCH_MILLIS);
// Windowing
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.IMPOSE_ORDER);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.TUMBLE);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.HOP);
// JSON
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.JSON_QUERY);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.JSON_VALUE);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.JSON_OBJECT);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.JSON_ARRAY);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.JSON_ARRAYAGG_ABSENT_ON_NULL);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.JSON_ARRAYAGG_NULL_ON_NULL);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.JSON_OBJECTAGG_ABSENT_ON_NULL);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.JSON_OBJECTAGG_NULL_ON_NULL);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.WITHIN_GROUP);
// Extensions
SUPPORTED_OPERATORS.add(SqlOption.OPERATOR);
SUPPORTED_OPERATORS.add(SqlShowStatement.SHOW_MAPPINGS);
SUPPORTED_OPERATORS.add(SqlShowStatement.SHOW_VIEWS);
SUPPORTED_OPERATORS.add(SqlShowStatement.SHOW_JOBS);
SUPPORTED_OPERATORS.add(SqlShowStatement.SHOW_TYPES);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.GENERATE_SERIES);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.GENERATE_STREAM);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.CSV_FILE);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.JSON_FLAT_FILE);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.AVRO_FILE);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.PARQUET_FILE);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.DOT);
SUPPORTED_OPERATORS.add(HazelcastSqlOperatorTable.TO_ROW);
// SYMBOLS
SUPPORTED_SYMBOLS = new HashSet<>();
SUPPORTED_SYMBOLS.add(SqlTrimFunction.Flag.LEADING);
SUPPORTED_SYMBOLS.add(SqlTrimFunction.Flag.TRAILING);
SUPPORTED_SYMBOLS.add(SqlTrimFunction.Flag.BOTH);
// `SELECT ALL` is the opposite of `SELECT DISTINCT` and it's the default if neither is used, we allow it
SUPPORTED_SYMBOLS.add(SqlSelectKeyword.DISTINCT);
SUPPORTED_SYMBOLS.add(SqlSelectKeyword.ALL);
SUPPORTED_SYMBOLS.add(JoinType.INNER);
SUPPORTED_SYMBOLS.add(JoinType.COMMA);
SUPPORTED_SYMBOLS.add(JoinType.CROSS);
SUPPORTED_SYMBOLS.add(JoinType.LEFT);
SUPPORTED_SYMBOLS.add(JoinType.RIGHT);
SUPPORTED_SYMBOLS.add(JoinConditionType.ON);
SUPPORTED_SYMBOLS.add(JoinConditionType.NONE);
SUPPORTED_SYMBOLS.add(JoinConditionType.USING);
SUPPORTED_SYMBOLS.add(SqlJsonQueryWrapperBehavior.WITHOUT_ARRAY);
SUPPORTED_SYMBOLS.add(SqlJsonQueryWrapperBehavior.WITH_CONDITIONAL_ARRAY);
SUPPORTED_SYMBOLS.add(SqlJsonQueryWrapperBehavior.WITH_UNCONDITIONAL_ARRAY);
SUPPORTED_SYMBOLS.add(SqlJsonQueryEmptyOrErrorBehavior.ERROR);
SUPPORTED_SYMBOLS.add(SqlJsonQueryEmptyOrErrorBehavior.NULL);
SUPPORTED_SYMBOLS.add(SqlJsonQueryEmptyOrErrorBehavior.EMPTY_ARRAY);
SUPPORTED_SYMBOLS.add(SqlJsonQueryEmptyOrErrorBehavior.EMPTY_OBJECT);
SUPPORTED_SYMBOLS.add(SqlJsonValueReturning.RETURNING);
SUPPORTED_SYMBOLS.add(SqlJsonValueEmptyOrErrorBehavior.ERROR);
SUPPORTED_SYMBOLS.add(SqlJsonValueEmptyOrErrorBehavior.NULL);
SUPPORTED_SYMBOLS.add(SqlJsonValueEmptyOrErrorBehavior.DEFAULT);
SUPPORTED_SYMBOLS.add(SqlJsonEmptyOrError.EMPTY);
SUPPORTED_SYMBOLS.add(SqlJsonEmptyOrError.ERROR);
SUPPORTED_SYMBOLS.add(SqlJsonConstructorNullClause.NULL_ON_NULL);
SUPPORTED_SYMBOLS.add(SqlJsonConstructorNullClause.ABSENT_ON_NULL);
}
private final boolean isValidated;
// The top level select is used to filter out nested selects with FETCH/OFFSET
private SqlSelect topLevelSelect;
public UnsupportedOperationVisitor(boolean isValidated) {
this.isValidated = isValidated;
}
@Override
public Void visit(SqlCall call) {
// remove the branch when MAP/MAP_VALUE_CONSTRUCTOR gets proper support
if (!(call.getOperator() instanceof HazelcastDynamicTableFunction)) {
processCall(call);
call.getOperator().acceptCall(this, call);
}
return null;
}
@Override
public Void visit(SqlDataTypeSpec type) {
if (type.getTypeNameSpec() instanceof SqlUserDefinedTypeNameSpec) {
SqlIdentifier typeName = type.getTypeName();
if (HazelcastTypeUtils.isObjectIdentifier(typeName)) {
return null;
}
}
if (HazelcastTypeUtils.isJsonIdentifier(type.getTypeName())) {
return null;
}
if (!(type.getTypeNameSpec() instanceof SqlBasicTypeNameSpec)) {
throw error(type, RESOURCE.error("Complex type specifications are not supported"));
}
SqlTypeName typeName = SqlTypeName.get(type.getTypeName().getSimple());
switch (typeName) {
case BOOLEAN:
case TINYINT:
case SMALLINT:
case INTEGER:
case BIGINT:
case DECIMAL:
case REAL:
case DOUBLE:
case VARCHAR:
case DATE:
case TIME:
case TIMESTAMP:
case TIMESTAMP_WITH_LOCAL_TIME_ZONE:
case NULL:
return null;
case CHAR:
// char should be not accessible by users, we have only VARCHAR
case ANY:
// visible to users as OBJECT
default:
throw error(type, ValidatorResource.RESOURCE.notSupported(typeName.getName()));
}
}
@Override
@SuppressWarnings("checkstyle:ReturnCount")
public Void visit(SqlLiteral literal) {
SqlTypeName typeName = literal.getTypeName();
if (HazelcastTypeUtils.isIntervalType(typeName)) {
return null;
}
switch (typeName) {
case BOOLEAN:
case TINYINT:
case SMALLINT:
case INTEGER:
case BIGINT:
case DECIMAL:
case REAL:
case DOUBLE:
case VARCHAR:
// CHAR is present here to support string literals: Calcite expects
// string literals to be of CHAR type, not VARCHAR. Validated type
// of string literals is still VARCHAR in HazelcastSqlValidator.
case CHAR:
case TIMESTAMP:
case TIMESTAMP_WITH_LOCAL_TIME_ZONE:
case DATE:
case TIME:
case ANY:
case NULL:
return null;
case SYMBOL:
Enum symbolValue = (Enum) literal.getValue();
if (SUPPORTED_SYMBOLS.contains(symbolValue)) {
return null;
}
throw error(literal, RESOURCE.error(symbolValue + " is not supported"));
default:
throw error(literal, RESOURCE.error(typeName + " literals are not supported"));
}
}
private void processCall(SqlCall call) {
SqlKind kind = call.getKind();
if (SUPPORTED_KINDS.contains(kind)) {
return;
}
switch (kind) {
case SELECT:
processSelect((SqlSelect) call);
break;
case UPDATE:
case DELETE:
break;
case JOIN:
processJoin((SqlJoin) call);
break;
case OTHER:
case OTHER_FUNCTION:
case EXTRACT:
case POSITION:
case EXISTS:
processOther(call);
break;
case OTHER_DDL:
processOtherDdl(call);
break;
case ORDER_BY:
case EXPLICIT_TABLE:
case MAP_VALUE_CONSTRUCTOR:
// these kinds do not occur after validation
if (isValidated) {
throw unsupported(call, kind);
}
break;
default:
throw unsupported(call, kind);
}
}
private void processSelect(SqlSelect select) {
if (topLevelSelect == null) {
topLevelSelect = select;
} else {
// Check for nested fetch offset
if (select.getFetch() != null || select.getOffset() != null) {
throw error(select, "FETCH/OFFSET is only supported for the top-level SELECT");
}
}
}
private void processJoin(SqlJoin join) {
JoinType joinType = join.getJoinType();
if (joinType != JoinType.INNER
&& joinType != JoinType.COMMA
&& joinType != JoinType.CROSS
&& joinType != JoinType.LEFT
&& joinType != JoinType.RIGHT
) {
throw unsupported(join, joinType.name() + " join");
}
}
private void processOther(SqlCall call) {
// Before the validation, some function calls are SqlUnresolvedFunction, some have the calcite
// representation, such as SqlJsonValueFunction instead of HazelcastJsonValueFunction etc.
// They will be validated after validation, ignore it in the pre-validation check.
if (!isValidated) {
return;
}
SqlOperator operator = call.getOperator();
if (SUPPORTED_OPERATORS.contains(operator)) {
return;
}
throw unsupported(call, operator.getName());
}
private void processOtherDdl(SqlCall call) {
if (!(call instanceof SqlCreateJob)
&& !(call instanceof SqlDropJob)
&& !(call instanceof SqlAlterJob)
&& !(call instanceof SqlCreateSnapshot)
&& !(call instanceof SqlDropSnapshot)
) {
throw unsupported(call, "OTHER DDL class (" + call.getClass().getSimpleName() + ")");
}
}
private CalciteContextException unsupported(SqlNode node, SqlKind kind) {
return unsupported(node, kind.sql.replace('_', ' '));
}
private CalciteContextException unsupported(SqlNode node, String name) {
return error(node, ValidatorResource.RESOURCE.notSupported(name));
}
private static CalciteContextException error(SqlNode node, ExInst error) {
return SqlUtil.newContextException(node.getParserPosition(), error);
}
public static CalciteContextException error(SqlNode node, String name) {
return error(node, RESOURCE.error(name));
}
}
