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/*
* Copyright (c) 2008-2020, Hazelcast, Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in com.hazelcast.com.liance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.com.hazelcast.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.
*/
package com.hazelcast.com.hazelcast.sql.impl.calcite.validate;
import com.hazelcast.com.hazelcast.sql.impl.calcite.schema.HazelcastTable;
import com.hazelcast.com.hazelcast.sql.impl.calcite.validate.types.HazelcastIntegerType;
import com.hazelcast.com.hazelcast.sql.impl.calcite.validate.types.HazelcastTypeCoercion;
import com.hazelcast.com.hazelcast.sql.impl.calcite.validate.types.HazelcastTypeFactory;
import com.hazelcast.org.apache.calcite.rel.type.RelDataType;
import com.hazelcast.org.apache.calcite.sql.SqlCall;
import com.hazelcast.org.apache.calcite.sql.SqlIdentifier;
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.SqlOperatorTable;
import com.hazelcast.org.apache.calcite.sql.SqlUtil;
import com.hazelcast.org.apache.calcite.sql.fun.SqlStdOperatorTable;
import com.hazelcast.org.apache.calcite.sql.type.SqlTypeName;
import com.hazelcast.org.apache.calcite.sql.util.ChainedSqlOperatorTable;
import com.hazelcast.org.apache.calcite.sql.validate.SelectScope;
import com.hazelcast.org.apache.calcite.sql.validate.SqlConformance;
import com.hazelcast.org.apache.calcite.sql.validate.SqlQualified;
import com.hazelcast.org.apache.calcite.sql.validate.SqlValidatorCatalogReader;
import com.hazelcast.org.apache.calcite.sql.validate.SqlValidatorImpl;
import com.hazelcast.org.apache.calcite.sql.validate.SqlValidatorScope;
import com.hazelcast.org.apache.calcite.sql.validate.SqlValidatorTable;
import com.hazelcast.org.apache.calcite.util.Util;
import java.util.ArrayList;
import java.util.IdentityHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import static com.hazelcast.com.hazelcast.sql.impl.calcite.validate.SqlNodeUtil.isLiteral;
import static com.hazelcast.com.hazelcast.sql.impl.calcite.validate.SqlNodeUtil.isParameter;
import static com.hazelcast.com.hazelcast.sql.impl.calcite.validate.SqlNodeUtil.numericValue;
import static com.hazelcast.com.hazelcast.sql.impl.calcite.validate.types.HazelcastTypeSystem.canRepresent;
import static com.hazelcast.com.hazelcast.sql.impl.calcite.validate.types.HazelcastTypeSystem.isInteger;
import static com.hazelcast.com.hazelcast.sql.impl.calcite.validate.types.HazelcastTypeSystem.isNumeric;
import static com.hazelcast.com.hazelcast.sql.impl.calcite.validate.types.HazelcastTypeSystem.narrowestTypeFor;
import static com.hazelcast.com.hazelcast.sql.impl.calcite.validate.types.HazelcastTypeSystem.typeName;
import static com.hazelcast.org.apache.calcite.sql.type.SqlTypeName.CHAR;
import static com.hazelcast.org.apache.calcite.sql.type.SqlTypeName.DECIMAL;
import static com.hazelcast.org.apache.calcite.sql.type.SqlTypeName.NULL;
import static com.hazelcast.org.apache.calcite.sql.type.SqlTypeName.NUMERIC_TYPES;
import static com.hazelcast.org.apache.calcite.sql.type.SqlTypeName.VARCHAR;
import static com.hazelcast.org.apache.calcite.util.Static.RESOURCE;
/**
* Hazelcast-specific SQL validator.
*/
public class HazelcastSqlValidator extends SqlValidatorImpl {
private static final Config CONFIG = Config.DEFAULT.withIdentifierExpansion(true);
/**
* We manage an additional map of known node types on our own to workaround
* a bug in {@link SqlValidatorImpl#getValidatedNodeTypeIfKnown}: it's
* supposed to return {@code null} if a node type is unknown, but for
* rewritten expressions ({@code originalExprs}) it still invokes {@link
* SqlValidatorImpl#getValidatedNodeType} under the hood and that leads to
* exceptions for nodes with unknown types instead of the expected {@code
* null} result.
*/
private final Map knownNodeTypes = new IdentityHashMap<>();
public HazelcastSqlValidator(
SqlValidatorCatalogReader catalogReader,
HazelcastTypeFactory typeFactory,
SqlConformance conformance
) {
this(null, catalogReader, typeFactory, conformance);
}
public HazelcastSqlValidator(
SqlOperatorTable extensionOperatorTable,
SqlValidatorCatalogReader catalogReader,
HazelcastTypeFactory typeFactory,
SqlConformance conformance
) {
super(operatorTable(extensionOperatorTable), catalogReader, typeFactory, CONFIG.withSqlConformance(conformance));
setTypeCoercion(new HazelcastTypeCoercion(this));
}
private static SqlOperatorTable operatorTable(SqlOperatorTable extensionOperatorTable) {
List operatorTables = new ArrayList<>();
if (extensionOperatorTable != null) {
operatorTables.add(extensionOperatorTable);
}
operatorTables.add(HazelcastSqlOperatorTable.instance());
operatorTables.add(SqlStdOperatorTable.instance());
return new ChainedSqlOperatorTable(operatorTables);
}
/**
* Sets {@code type} as the known type for {@code node}.
*
* @param node the node to set the known type of.
* @param type the type to set the know node type to.
*/
public void setKnownNodeType(SqlNode node, RelDataType type) {
assert !getUnknownType().equals(type);
knownNodeTypes.put(node, type);
}
/**
* Obtains a type known by this validator for the given node.
*
* @param node the node to obtain the type of.
* @return the node type known by this validator or {@code null} if the type
* of the given node is not known yet.
*/
public RelDataType getKnownNodeType(SqlNode node) {
return knownNodeTypes.get(node);
}
@Override
protected void addToSelectList(List list, Set aliases, List> fieldList,
SqlNode exp, SelectScope scope, boolean includeSystemVars) {
if (isHiddenColumn(exp, scope)) {
return;
}
super.addToSelectList(list, aliases, fieldList, exp, scope, includeSystemVars);
}
@Override
public RelDataType deriveType(SqlValidatorScope scope, SqlNode expression) {
RelDataType derived = super.deriveType(scope, expression);
assert derived != null;
if (derived.getSqlTypeName() == CHAR) {
// normalize CHAR to VARCHAR
derived = HazelcastTypeFactory.INSTANCE.createSqlType(VARCHAR, derived.isNullable());
setValidatedNodeType(expression, derived);
}
switch (expression.getKind()) {
case LITERAL:
return deriveLiteralType(derived, expression);
case CAST:
return deriveCastType(derived, scope, expression);
default:
return derived;
}
}
@Override
public void validateLiteral(SqlLiteral literal) {
validateLiteral(literal, getValidatedNodeType(literal));
}
@Override
public void validateCall(SqlCall call, SqlValidatorScope scope) {
// Enforce type derivation for all calls before validation. Calcite may
// skip it if a call has a fixed type, for instance AND always has
// BOOLEAN type, so operands may end up having no validated type.
deriveType(scope, call);
super.validateCall(call, scope);
}
@Override
protected SqlNode performUnconditionalRewrites(SqlNode node, boolean underFrom) {
SqlNode rewritten = super.performUnconditionalRewrites(node, underFrom);
if (rewritten != null && rewritten.isA(SqlKind.TOP_LEVEL)) {
// Rewrite operators to Hazelcast ones starting at every top node.
// For instance, SELECT a + b is rewritten to SELECT a + b, where
// the first '+' refers to the standard Calcite SqlStdOperatorTable.PLUS
// operator and the second '+' refers to HazelcastSqlOperatorTable.PLUS
// operator.
rewritten.accept(HazelcastOperatorTableVisitor.INSTANCE);
}
return rewritten;
}
private RelDataType deriveLiteralType(RelDataType derived, SqlNode expression) {
RelDataType known = knownNodeTypes.get(expression);
if (derived == known) {
return derived;
}
SqlLiteral literal = (SqlLiteral) expression;
if (HazelcastIntegerType.supports(typeName(derived)) && literal.getValue() != null) {
// Assign narrowest type to non-null integer literals.
derived = HazelcastIntegerType.deriveLiteralType(literal);
setKnownAndValidatedNodeType(expression, derived);
}
return derived;
}
@SuppressWarnings({"checkstyle:CyclomaticComplexity", "checkstyle:NPathComplexity"})
private RelDataType deriveCastType(RelDataType derived, SqlValidatorScope scope, SqlNode expression) {
RelDataType known = knownNodeTypes.get(expression);
if (derived == known) {
return derived;
}
SqlCall call = (SqlCall) expression;
SqlNode operand = call.operand(0);
RelDataType from = deriveType(scope, operand);
RelDataType to = deriveType(scope, call.operand(1));
assert !to.isNullable();
// Handle NULL.
if (SqlUtil.isNullLiteral(operand, false)) {
setKnownAndValidatedNodeType(operand, HazelcastTypeFactory.INSTANCE.createSqlType(NULL));
derived = HazelcastTypeFactory.INSTANCE.createTypeWithNullability(to, true);
setKnownAndValidatedNodeType(expression, derived);
return derived;
}
derived = to;
// Assign type for parameters.
if (isParameter(operand)) {
from = HazelcastTypeFactory.INSTANCE.createTypeWithNullability(to, true);
}
// Assign type to numeric literals and validate them.
Number numeric = isNumeric(from) || isNumeric(to) ? numericValue(operand) : null;
if (numeric != null) {
from = narrowestTypeFor(numeric, typeName(to));
}
if (isLiteral(operand)) {
validateLiteral((SqlLiteral) operand, to);
}
// Infer return type.
if (isInteger(to) && isInteger(from)) {
derived = HazelcastIntegerType.deriveCastType(from, to);
} else if (isInteger(to) && numeric != null) {
long longValue = numeric.longValue();
derived = HazelcastIntegerType.deriveCastType(longValue, to);
}
derived = HazelcastTypeFactory.INSTANCE.createTypeWithNullability(derived, from.isNullable());
setKnownAndValidatedNodeType(operand, from);
setKnownAndValidatedNodeType(expression, derived);
return derived;
}
private void validateLiteral(SqlLiteral literal, RelDataType type) {
SqlTypeName literalTypeName = literal.getTypeName();
if (!canRepresent(literal, type)) {
if (NUMERIC_TYPES.contains(literalTypeName) && isNumeric(type)) {
throw newValidationError(literal, RESOURCE.numberLiteralOutOfRange(literal.toString()));
} else {
throw SqlUtil.newContextException(literal.getParserPosition(),
RESOURCE.invalidLiteral(literal.toString(), type.toString()));
}
}
if (literalTypeName != DECIMAL) {
super.validateLiteral(literal);
}
}
private void setKnownAndValidatedNodeType(SqlNode node, RelDataType type) {
setKnownNodeType(node, type);
setValidatedNodeType(node, type);
}
private boolean isHiddenColumn(SqlNode node, SelectScope scope) {
if (!(node instanceof SqlIdentifier)) {
return false;
}
SqlIdentifier identifier = (SqlIdentifier) node;
String fieldName = extractFieldName(identifier, scope);
if (fieldName == null) {
return false;
}
SqlValidatorTable table = scope.fullyQualify(identifier).namespace.getTable();
if (table == null) {
return false;
}
HazelcastTable unwrappedTable = table.unwrap(HazelcastTable.class);
if (unwrappedTable == null) {
return false;
}
return unwrappedTable.isHidden(fieldName);
}
private String extractFieldName(SqlIdentifier identifier, SelectScope scope) {
SqlCall call = makeNullaryCall(identifier);
if (call != null) {
return null;
}
SqlQualified qualified = scope.fullyQualify(identifier);
List names = qualified.identifier.names;
if (names.size() < 2) {
return null;
}
return Util.last(names);
}
}
