/**
* Adds a child to this expression.
*
* @param child child to add
*/
public void addChild(SargExpr child) {
assert (child.getDataType() == dataType);
if (setOp == SargSetOperator.COMPLEMENT) {
assert (children.isEmpty());
}
children.add(child);
}
public List<SqlMoniker> getAllSchemaObjectNames(List<String> names) {
List<SqlMoniker> result;
switch (names.size()) {
case 0:
// looking for schema names
result = new ArrayList<SqlMoniker>();
for (MockSchema schema : schemas.values()) {
result.add(new SqlMonikerImpl(schema.name, SqlMonikerType.Schema));
}
return result;
case 1:
// looking for table names in the given schema
MockSchema schema = schemas.get(names.get(0));
if (schema == null) {
return Collections.emptyList();
}
result = new ArrayList<SqlMoniker>();
for (String tableName : schema.tableNames) {
result.add(new SqlMonikerImpl(tableName, SqlMonikerType.Table));
}
return result;
default:
return Collections.emptyList();
}
}
/** Variant of {@link #trimFields(RelNode, BitSet, Set)} for {@link TableFunctionRel}. */
public TrimResult trimFields(
TableFunctionRel tabFun, BitSet fieldsUsed, Set<RelDataTypeField> extraFields) {
final RelDataType rowType = tabFun.getRowType();
final int fieldCount = rowType.getFieldCount();
List<RelNode> newInputs = new ArrayList<RelNode>();
for (RelNode input : tabFun.getInputs()) {
final int inputFieldCount = input.getRowType().getFieldCount();
BitSet inputFieldsUsed = Util.bitSetBetween(0, inputFieldCount);
// Create input with trimmed columns.
final Set<RelDataTypeField> inputExtraFields = Collections.emptySet();
TrimResult trimResult = trimChildRestore(tabFun, input, inputFieldsUsed, inputExtraFields);
assert trimResult.right.isIdentity();
newInputs.add(trimResult.left);
}
TableFunctionRel newTabFun = tabFun;
if (!tabFun.getInputs().equals(newInputs)) {
newTabFun = tabFun.copy(tabFun.getTraitSet(), newInputs);
}
assert newTabFun.getClass() == tabFun.getClass();
// Always project all fields.
Mapping mapping = Mappings.createIdentity(fieldCount);
return new TrimResult(newTabFun, mapping);
}
/**
* Creates a relational expression which projects an array of expressions, and optionally
* optimizes.
*
* <p>The result may not be a {@link ProjectRel}. If the projection is trivial, <code>child</code>
* is returned directly; and future versions may return other formulations of expressions, such as
* {@link CalcRel}.
*
* @param child input relational expression
* @param exprs list of expressions for the input columns
* @param fieldNames aliases of the expressions, or null to generate
* @param optimize Whether to return <code>child</code> unchanged if the projections are trivial.
*/
public static RelNode createProject(
RelNode child, List<RexNode> exprs, List<String> fieldNames, boolean optimize) {
final RelOptCluster cluster = child.getCluster();
final RexProgram program =
RexProgram.create(child.getRowType(), exprs, null, fieldNames, cluster.getRexBuilder());
final List<RelCollation> collationList = program.getCollations(child.getCollationList());
if (DeprecateProjectAndFilter) {
return new CalcRel(
cluster, child.getTraitSet(), child, program.getOutputRowType(), program, collationList);
} else {
final RelDataType rowType =
RexUtil.createStructType(cluster.getTypeFactory(), exprs, fieldNames);
if (optimize && RemoveTrivialProjectRule.isIdentity(exprs, rowType, child.getRowType())) {
return child;
}
return new ProjectRel(
cluster,
cluster.traitSetOf(
collationList.isEmpty() ? RelCollationImpl.EMPTY : collationList.get(0)),
child,
exprs,
rowType,
ProjectRelBase.Flags.Boxed);
}
}
/**
* Determines if a filter condition is a simple one and returns the parameters corresponding to
* the simple filters.
*
* @param calcRel original CalcRel
* @param filterExprs filter expression being analyzed
* @param filterList returns the list of filter ordinals in the simple expression
* @param literals returns the list of literals to be used in the simple comparisons
* @param op returns the operator to be used in the simple comparison
* @return true if the filter condition is simple
*/
private boolean isConditionSimple(
CalcRel calcRel,
RexNode filterExprs,
List<Integer> filterList,
List<RexLiteral> literals,
List<CompOperatorEnum> op) {
SargFactory sargFactory = new SargFactory(calcRel.getCluster().getRexBuilder());
SargRexAnalyzer rexAnalyzer = sargFactory.newRexAnalyzer(true);
List<SargBinding> sargBindingList = rexAnalyzer.analyzeAll(filterExprs);
// Currently, it's all or nothing. So, if there are filters rejected
// by the analyzer, we can't process a subset using the reshape
// exec stream
if (rexAnalyzer.getNonSargFilterRexNode() != null) {
return false;
}
List<RexInputRef> filterCols = new ArrayList<RexInputRef>();
List<RexNode> filterOperands = new ArrayList<RexNode>();
if (FennelRelUtil.extractSimplePredicates(sargBindingList, filterCols, filterOperands, op)) {
for (RexInputRef filterCol : filterCols) {
filterList.add(filterCol.getIndex());
}
for (RexNode operand : filterOperands) {
literals.add((RexLiteral) operand);
}
return true;
} else {
return false;
}
}
/**
* Creates a relational expression which projects an array of expressions, and optionally
* optimizes.
*
* <p>The result may not be a {@link ProjectRel}. If the projection is trivial, <code>child</code>
* is returned directly; and future versions may return other formulations of expressions, such as
* {@link CalcRel}.
*
* @param child input relational expression
* @param exprs list of expressions for the input columns
* @param fieldNames aliases of the expressions, or null to generate
* @param optimize Whether to return <code>child</code> unchanged if the projections are trivial.
*/
public static RelNode createProject(
RelNode child, List<RexNode> exprs, List<String> fieldNames, boolean optimize) {
final RelOptCluster cluster = child.getCluster();
final RexProgram program =
RexProgram.create(child.getRowType(), exprs, null, fieldNames, cluster.getRexBuilder());
final List<RelCollation> collationList = program.getCollations(child.getCollationList());
if (DEPRECATE_PROJECT_AND_FILTER) {
return new CalcRel(
cluster, child.getTraitSet(), child, program.getOutputRowType(), program, collationList);
} else {
final RelDataType rowType =
RexUtil.createStructType(
cluster.getTypeFactory(),
exprs,
fieldNames == null
? null
: SqlValidatorUtil.uniquify(fieldNames, SqlValidatorUtil.F_SUGGESTER));
if (optimize && RemoveTrivialProjectRule.isIdentity(exprs, rowType, child.getRowType())) {
return child;
}
return new ProjectRel(
cluster,
cluster.traitSetOf(
collationList.isEmpty() ? RelCollationImpl.EMPTY : collationList.get(0)),
child,
exprs,
rowType,
ProjectRelBase.Flags.BOXED);
}
}
private void analyzeCall(RexCall call, Constancy callConstancy) {
parentCallTypeStack.add(call.getOperator());
// visit operands, pushing their states onto stack
super.visitCall(call);
// look for NON_CONSTANT operands
int nOperands = call.getOperands().length;
List<Constancy> operandStack = stack.subList(stack.size() - nOperands, stack.size());
for (Constancy operandConstancy : operandStack) {
if (operandConstancy == Constancy.NON_CONSTANT) {
callConstancy = Constancy.NON_CONSTANT;
}
}
// Even if all operands are constant, the call itself may
// be non-deterministic.
if (!call.getOperator().isDeterministic()) {
callConstancy = Constancy.NON_CONSTANT;
} else if (call.getOperator().isDynamicFunction()) {
// We can reduce the call to a constant, but we can't
// cache the plan if the function is dynamic
preparingStmt.disableStatementCaching();
}
// Row operator itself can't be reduced to a literal, but if
// the operands are constants, we still want to reduce those
if ((callConstancy == Constancy.REDUCIBLE_CONSTANT)
&& (call.getOperator() instanceof SqlRowOperator)) {
callConstancy = Constancy.NON_CONSTANT;
}
if (callConstancy == Constancy.NON_CONSTANT) {
// any REDUCIBLE_CONSTANT children are now known to be maximal
// reducible subtrees, so they can be added to the result
// list
for (int iOperand = 0; iOperand < nOperands; ++iOperand) {
Constancy constancy = operandStack.get(iOperand);
if (constancy == Constancy.REDUCIBLE_CONSTANT) {
addResult(call.getOperands()[iOperand]);
}
}
// if this cast expression can't be reduced to a literal,
// then see if we can remove the cast
if (call.getOperator() == SqlStdOperatorTable.castFunc) {
reduceCasts(call);
}
}
// pop operands off of the stack
operandStack.clear();
// pop this parent call operator off the stack
parentCallTypeStack.remove(parentCallTypeStack.size() - 1);
// push constancy result for this call onto stack
stack.add(callConstancy);
}
/**
* Applies a visitor to a list of expressions and, if specified, a single expression.
*
* @param visitor Visitor
* @param exprs List of expressions
* @param expr Single expression, may be null
*/
public static void apply(RexVisitor<Void> visitor, List<? extends RexNode> exprs, RexNode expr) {
for (int i = 0; i < exprs.size(); i++) {
exprs.get(i).accept(visitor);
}
if (expr != null) {
expr.accept(visitor);
}
}
/**
* Applies a mapping to a list of field collations.
*
* @param mapping Mapping
* @param fieldCollations Field collations
* @return collations with mapping applied
*/
public static List<RelFieldCollation> apply(
Mapping mapping, List<RelFieldCollation> fieldCollations) {
final List<RelFieldCollation> newFieldCollations =
new ArrayList<RelFieldCollation>(fieldCollations.size());
for (RelFieldCollation fieldCollation : fieldCollations) {
newFieldCollations.add(apply(mapping, fieldCollation));
}
return newFieldCollations;
}
private List<SargIntervalSequence> evaluateChildren(SargSetExpr setExpr) {
List<SargIntervalSequence> list = new ArrayList<SargIntervalSequence>();
for (SargExpr child : setExpr.children) {
SargIntervalSequence newSeq = child.evaluate();
list.add(newSeq);
}
return list;
}
/**
* Variant of {@link #trimFields(RelNode, BitSet, Set)} for {@link SetOpRel} (including UNION and
* UNION ALL).
*/
public TrimResult trimFields(
SetOpRel setOp, BitSet fieldsUsed, Set<RelDataTypeField> extraFields) {
final RelDataType rowType = setOp.getRowType();
final int fieldCount = rowType.getFieldCount();
int changeCount = 0;
// Fennel abhors an empty row type, so pretend that the parent rel
// wants the last field. (The last field is the least likely to be a
// system field.)
if (fieldsUsed.isEmpty()) {
fieldsUsed.set(rowType.getFieldCount() - 1);
}
// Compute the desired field mapping. Give the consumer the fields they
// want, in the order that they appear in the bitset.
final Mapping mapping = createMapping(fieldsUsed, fieldCount);
// Create input with trimmed columns.
final List<RelNode> newInputs = new ArrayList<RelNode>();
for (RelNode input : setOp.getInputs()) {
TrimResult trimResult = trimChild(setOp, input, fieldsUsed, extraFields);
RelNode newInput = trimResult.left;
final Mapping inputMapping = trimResult.right;
// We want "mapping", the input gave us "inputMapping", compute
// "remaining" mapping.
// | | |
// |---------------- mapping ---------->|
// |-- inputMapping -->| |
// | |-- remaining -->|
//
// For instance, suppose we have columns [a, b, c, d],
// the consumer asked for mapping = [b, d],
// and the transformed input has columns inputMapping = [d, a, b].
// remaining will permute [b, d] to [d, a, b].
Mapping remaining = Mappings.divide(mapping, inputMapping);
// Create a projection; does nothing if remaining is identity.
newInput = CalcRel.projectMapping(newInput, remaining, null);
if (input != newInput) {
++changeCount;
}
newInputs.add(newInput);
}
// If the input is unchanged, and we need to project all columns,
// there's to do.
if (changeCount == 0 && mapping.isIdentity()) {
return new TrimResult(setOp, mapping);
}
RelNode newSetOp = setOp.copy(setOp.getTraitSet(), newInputs);
return new TrimResult(newSetOp, mapping);
}
public void onMatch(RelOptRuleCall call) {
CalcRel calc = (CalcRel) call.getRels()[0];
RexProgram program = calc.getProgram();
final List<RexNode> exprList = program.getExprList();
// Form a list of expressions with sub-expressions fully
// expanded.
final List<RexNode> expandedExprList = new ArrayList<RexNode>(exprList.size());
final RexShuttle shuttle =
new RexShuttle() {
public RexNode visitLocalRef(RexLocalRef localRef) {
return expandedExprList.get(localRef.getIndex());
}
};
for (RexNode expr : exprList) {
expandedExprList.add(expr.accept(shuttle));
}
if (reduceExpressions(calc, expandedExprList)) {
final RexProgramBuilder builder =
new RexProgramBuilder(
calc.getChild().getRowType(), calc.getCluster().getRexBuilder());
List<RexLocalRef> list = new ArrayList<RexLocalRef>();
for (RexNode expr : expandedExprList) {
list.add(builder.registerInput(expr));
}
if (program.getCondition() != null) {
final int conditionIndex = program.getCondition().getIndex();
final RexNode newConditionExp = expandedExprList.get(conditionIndex);
if (newConditionExp.isAlwaysTrue()) {
// condition is always TRUE - drop it
} else if ((newConditionExp instanceof RexLiteral)
|| RexUtil.isNullLiteral(newConditionExp, true)) {
// condition is always NULL or FALSE - replace calc
// with empty
call.transformTo(new EmptyRel(calc.getCluster(), calc.getRowType()));
return;
} else {
builder.addCondition(list.get(conditionIndex));
}
}
int k = 0;
for (RexLocalRef projectExpr : program.getProjectList()) {
final int index = projectExpr.getIndex();
builder.addProject(
list.get(index).getIndex(),
program.getOutputRowType().getFieldList().get(k++).getName());
}
call.transformTo(
new CalcRel(
calc.getCluster(),
calc.getTraits(),
calc.getChild(),
calc.getRowType(),
builder.getProgram(),
calc.getCollationList()));
// New plan is absolutely better than old plan.
call.getPlanner().setImportance(calc, 0.0);
}
}
/**
* Creates an OR expression from a list of RexNodes
*
* @param rexList list of RexNodes
* @return OR'd expression
*/
public static RexNode orRexNodeList(RexBuilder rexBuilder, List<RexNode> rexList) {
if (rexList.isEmpty()) {
return null;
}
RexNode orExpr = rexList.get(rexList.size() - 1);
for (int i = rexList.size() - 2; i >= 0; i--) {
orExpr = rexBuilder.makeCall(SqlStdOperatorTable.orOperator, rexList.get(i), orExpr);
}
return orExpr;
}
public void onMatch(RelOptRuleCall call) {
JoinRel origJoinRel = (JoinRel) call.rels[0];
RelNode left = call.rels[1];
RelNode right = call.rels[2];
// combine the children MultiJoinRel inputs into an array of inputs
// for the new MultiJoinRel
List<BitSet> projFieldsList = new ArrayList<BitSet>();
List<int[]> joinFieldRefCountsList = new ArrayList<int[]>();
RelNode[] newInputs =
combineInputs(origJoinRel, left, right, projFieldsList, joinFieldRefCountsList);
// combine the outer join information from the left and right
// inputs, and include the outer join information from the current
// join, if it's a left/right outer join
RexNode[] newOuterJoinConds = new RexNode[newInputs.length];
JoinRelType[] joinTypes = new JoinRelType[newInputs.length];
combineOuterJoins(origJoinRel, newInputs, left, right, newOuterJoinConds, joinTypes);
// pull up the join filters from the children MultiJoinRels and
// combine them with the join filter associated with this JoinRel to
// form the join filter for the new MultiJoinRel
RexNode newJoinFilter = combineJoinFilters(origJoinRel, left, right);
// add on the join field reference counts for the join condition
// associated with this JoinRel
Map<Integer, int[]> newJoinFieldRefCountsMap = new HashMap<Integer, int[]>();
addOnJoinFieldRefCounts(
newInputs,
origJoinRel.getRowType().getFieldCount(),
origJoinRel.getCondition(),
joinFieldRefCountsList,
newJoinFieldRefCountsMap);
RexNode newPostJoinFilter = combinePostJoinFilters(origJoinRel, left, right);
RelNode multiJoin =
new MultiJoinRel(
origJoinRel.getCluster(),
newInputs,
newJoinFilter,
origJoinRel.getRowType(),
(origJoinRel.getJoinType() == JoinRelType.FULL),
newOuterJoinConds,
joinTypes,
projFieldsList.toArray(new BitSet[projFieldsList.size()]),
newJoinFieldRefCountsMap,
newPostJoinFilter);
call.transformTo(multiJoin);
}
/**
* Locates expressions that can be reduced to literals or converted to expressions with redundant
* casts removed.
*
* @param preparingStmt the statement containing the expressions
* @param exps list of candidate expressions to be examined for reduction
* @param constExps returns the list of expressions that can be constant reduced
* @param addCasts indicator for each expression that can be constant reduced, whether a cast of
* the resulting reduced expression is potentially necessary
* @param removableCasts returns the list of cast expressions where the cast can be removed
*/
private static void findReducibleExps(
FarragoSessionPreparingStmt preparingStmt,
List<RexNode> exps,
List<RexNode> constExps,
List<Boolean> addCasts,
List<RexNode> removableCasts) {
ReducibleExprLocator gardener =
new ReducibleExprLocator(preparingStmt, constExps, addCasts, removableCasts);
for (RexNode exp : exps) {
gardener.analyze(exp);
}
assert (constExps.size() == addCasts.size());
}
/**
* Creates an AND expression from a list of RexNodes
*
* @param rexList list of RexNodes
* @return AND'd expression
*/
public static RexNode andRexNodeList(RexBuilder rexBuilder, List<RexNode> rexList) {
if (rexList.isEmpty()) {
return null;
}
// create a right-deep tree to allow short-circuiting during
// expression evaluation
RexNode andExpr = rexList.get(rexList.size() - 1);
for (int i = rexList.size() - 2; i >= 0; i--) {
andExpr = rexBuilder.makeCall(SqlStdOperatorTable.andOperator, rexList.get(i), andExpr);
}
return andExpr;
}
/**
* Derives the list of column names suitable for NATURAL JOIN. These are the columns that occur
* exactly once on each side of the join.
*
* @param leftRowType Row type of left input to the join
* @param rightRowType Row type of right input to the join
* @return List of columns that occur once on each side
*/
public static List<String> deriveNaturalJoinColumnList(
RelDataType leftRowType, RelDataType rightRowType) {
List<String> naturalColumnNames = new ArrayList<String>();
final List<String> leftNames = leftRowType.getFieldNames();
final List<String> rightNames = rightRowType.getFieldNames();
for (String name : leftNames) {
if ((Collections.frequency(leftNames, name) == 1)
&& (Collections.frequency(rightNames, name) == 1)) {
naturalColumnNames.add(name);
}
}
return naturalColumnNames;
}
/**
* Resolves a multi-part identifier such as "SCHEMA.EMP.EMPNO" to a namespace. The returned
* namespace may represent a schema, table, column, etc.
*
* @pre names.size() > 0
* @post return != null
*/
public static SqlValidatorNamespace lookup(SqlValidatorScope scope, List<String> names) {
Util.pre(names.size() > 0, "names.size() > 0");
SqlValidatorNamespace namespace = null;
for (int i = 0; i < names.size(); i++) {
String name = names.get(i);
if (i == 0) {
namespace = scope.resolve(name, null, null);
} else {
namespace = namespace.lookupChild(name);
}
}
Util.permAssert(namespace != null, "post: namespace != null");
return namespace;
}
public Boolean areColumnsUnique(ProjectRelBase rel, BitSet columns, boolean ignoreNulls) {
// ProjectRel maps a set of rows to a different set;
// Without knowledge of the mapping function(whether it
// preserves uniqueness), it is only safe to derive uniqueness
// info from the child of a project when the mapping is f(a) => a.
//
// Also need to map the input column set to the corresponding child
// references
List<RexNode> projExprs = rel.getProjects();
BitSet childColumns = new BitSet();
for (int bit : BitSets.toIter(columns)) {
RexNode projExpr = projExprs.get(bit);
if (projExpr instanceof RexInputRef) {
childColumns.set(((RexInputRef) projExpr).getIndex());
} else if (projExpr instanceof RexCall && ignoreNulls) {
// If the expression is a cast such that the types are the same
// except for the nullability, then if we're ignoring nulls,
// it doesn't matter whether the underlying column reference
// is nullable. Check that the types are the same by making a
// nullable copy of both types and then comparing them.
RexCall call = (RexCall) projExpr;
if (call.getOperator() != SqlStdOperatorTable.CAST) {
continue;
}
RexNode castOperand = call.getOperands().get(0);
if (!(castOperand instanceof RexInputRef)) {
continue;
}
RelDataTypeFactory typeFactory = rel.getCluster().getTypeFactory();
RelDataType castType = typeFactory.createTypeWithNullability(projExpr.getType(), true);
RelDataType origType = typeFactory.createTypeWithNullability(castOperand.getType(), true);
if (castType.equals(origType)) {
childColumns.set(((RexInputRef) castOperand).getIndex());
}
} else {
// If the expression will not influence uniqueness of the
// projection, then skip it.
continue;
}
}
// If no columns can affect uniqueness, then return unknown
if (childColumns.cardinality() == 0) {
return null;
}
return RelMetadataQuery.areColumnsUnique(rel.getChild(), childColumns, ignoreNulls);
}
// implement RelOptRule
public void onMatch(RelOptRuleCall call) {
ProjectRel origProj = call.rel(0);
JoinRel joinRel = call.rel(1);
// locate all fields referenced in the projection and join condition;
// determine which inputs are referenced in the projection and
// join condition; if all fields are being referenced and there are no
// special expressions, no point in proceeding any further
PushProjector pushProject =
new PushProjector(origProj, joinRel.getCondition(), joinRel, preserveExprCondition);
if (pushProject.locateAllRefs()) {
return;
}
// create left and right projections, projecting only those
// fields referenced on each side
RelNode leftProjRel = pushProject.createProjectRefsAndExprs(joinRel.getLeft(), true, false);
RelNode rightProjRel = pushProject.createProjectRefsAndExprs(joinRel.getRight(), true, true);
// convert the join condition to reference the projected columns
RexNode newJoinFilter = null;
int[] adjustments = pushProject.getAdjustments();
if (joinRel.getCondition() != null) {
List<RelDataTypeField> projJoinFieldList = new ArrayList<RelDataTypeField>();
projJoinFieldList.addAll(joinRel.getSystemFieldList());
projJoinFieldList.addAll(leftProjRel.getRowType().getFieldList());
projJoinFieldList.addAll(rightProjRel.getRowType().getFieldList());
newJoinFilter =
pushProject.convertRefsAndExprs(joinRel.getCondition(), projJoinFieldList, adjustments);
}
// create a new joinrel with the projected children
JoinRel newJoinRel =
new JoinRel(
joinRel.getCluster(),
leftProjRel,
rightProjRel,
newJoinFilter,
joinRel.getJoinType(),
Collections.<String>emptySet(),
joinRel.isSemiJoinDone(),
joinRel.getSystemFieldList());
// put the original project on top of the join, converting it to
// reference the modified projection list
ProjectRel topProject = pushProject.createNewProject(newJoinRel, adjustments);
call.transformTo(topProject);
}
/**
* Combines the inputs into a JoinRel into an array of inputs.
*
* @param join original join
* @param left left input into join
* @param right right input into join
* @param projFieldsList returns a list of the new combined projection fields
* @param joinFieldRefCountsList returns a list of the new combined join field reference counts
* @return combined left and right inputs in an array
*/
private RelNode[] combineInputs(
JoinRel join,
RelNode left,
RelNode right,
List<BitSet> projFieldsList,
List<int[]> joinFieldRefCountsList) {
// leave the null generating sides of an outer join intact; don't
// pull up those children inputs into the array we're constructing
int nInputs;
int nInputsOnLeft;
MultiJoinRel leftMultiJoin = null;
JoinRelType joinType = join.getJoinType();
boolean combineLeft = canCombine(left, joinType.generatesNullsOnLeft());
if (combineLeft) {
leftMultiJoin = (MultiJoinRel) left;
nInputs = left.getInputs().length;
nInputsOnLeft = nInputs;
} else {
nInputs = 1;
nInputsOnLeft = 1;
}
MultiJoinRel rightMultiJoin = null;
boolean combineRight = canCombine(right, joinType.generatesNullsOnRight());
if (combineRight) {
rightMultiJoin = (MultiJoinRel) right;
nInputs += right.getInputs().length;
} else {
nInputs += 1;
}
RelNode[] newInputs = new RelNode[nInputs];
int i = 0;
if (combineLeft) {
for (; i < left.getInputs().length; i++) {
newInputs[i] = leftMultiJoin.getInput(i);
projFieldsList.add(((MultiJoinRel) left).getProjFields()[i]);
joinFieldRefCountsList.add(((MultiJoinRel) left).getJoinFieldRefCountsMap().get(i));
}
} else {
newInputs[0] = left;
i = 1;
projFieldsList.add(null);
joinFieldRefCountsList.add(new int[left.getRowType().getFieldCount()]);
}
if (combineRight) {
for (; i < nInputs; i++) {
newInputs[i] = rightMultiJoin.getInput(i - nInputsOnLeft);
projFieldsList.add(((MultiJoinRel) right).getProjFields()[i - nInputsOnLeft]);
joinFieldRefCountsList.add(
((MultiJoinRel) right).getJoinFieldRefCountsMap().get(i - nInputsOnLeft));
}
} else {
newInputs[i] = right;
projFieldsList.add(null);
joinFieldRefCountsList.add(new int[right.getRowType().getFieldCount()]);
}
return newInputs;
}
/**
* Returns a relational expression which has the same fields as the underlying expression, but the
* fields have different names.
*
* @param rel Relational expression
* @param fieldNames Field names
* @return Renamed relational expression
*/
public static RelNode createRename(RelNode rel, List<String> fieldNames) {
final List<RelDataTypeField> fields = rel.getRowType().getFieldList();
assert fieldNames.size() == fields.size();
final List<Pair<RexNode, String>> refs =
new AbstractList<Pair<RexNode, String>>() {
public int size() {
return fields.size();
}
public Pair<RexNode, String> get(int index) {
return RexInputRef.of2(index, fields);
}
};
return createProject(rel, refs, true);
}
public void analyze(RexNode exp) {
assert (stack.isEmpty());
exp.accept(this);
// Deal with top of stack
assert (stack.size() == 1);
assert (parentCallTypeStack.isEmpty());
Constancy rootConstancy = stack.get(0);
if (rootConstancy == Constancy.REDUCIBLE_CONSTANT) {
// The entire subtree was constant, so add it to the result.
addResult(exp);
}
stack.clear();
}
public Prepare.PreparingTable getTable(final List<String> names) {
switch (names.size()) {
case 1:
// assume table in SALES schema (the original default)
// if it's not supplied, because SqlValidatorTest is effectively
// using SALES as its default schema.
return tables.get(ImmutableList.of(defaultCatalog, defaultSchema, names.get(0)));
case 2:
return tables.get(ImmutableList.of(defaultCatalog, names.get(0), names.get(1)));
case 3:
return tables.get(names);
default:
return null;
}
}
public static void getSchemaObjectMonikers(
SqlValidatorCatalogReader catalogReader, List<String> names, List<SqlMoniker> hints) {
// Assume that the last name is 'dummy' or similar.
List<String> subNames = Util.skipLast(names);
hints.addAll(catalogReader.getAllSchemaObjectNames(subNames));
// If the name has length 0, try prepending the name of the default
// schema. So, the empty name would yield a list of tables in the
// default schema, as well as a list of schemas from the above code.
if (subNames.size() == 0) {
hints.addAll(
catalogReader.getAllSchemaObjectNames(
Collections.singletonList(catalogReader.getSchemaName())));
}
}
public static RelDataType createTypeFromProjection(
RelDataType type,
List<String> columnNameList,
RelDataTypeFactory typeFactory,
boolean caseSensitive) {
// If the names in columnNameList and type have case-sensitive differences,
// the resulting type will use those from type. These are presumably more
// canonical.
final List<RelDataTypeField> fields = new ArrayList<RelDataTypeField>(columnNameList.size());
for (String name : columnNameList) {
RelDataTypeField field = type.getField(name, caseSensitive);
fields.add(type.getFieldList().get(field.getIndex()));
}
return typeFactory.createStructType(fields);
}
private SargIntervalSequence evaluateIntersection(List<SargIntervalSequence> list) {
SargIntervalSequence seq = null;
if (list.isEmpty()) {
// Counterintuitive but true: intersection of no sets is the
// universal set (kinda like 2^0=1). One way to prove this to
// yourself is to apply DeMorgan's law. The union of no sets is
// certainly the empty set. So the complement of that union is the
// universal set. That's equivalent to the intersection of the
// complements of no sets, which is the intersection of no sets.
// QED.
seq = new SargIntervalSequence();
seq.addInterval(new SargInterval(factory, getDataType()));
return seq;
}
// The way we evaluate the intersection is to start with the first
// entry as a baseline, and then keep deleting stuff from it by
// intersecting the other entrie in turn. Whatever makes it through
// this filtering remains as the final result.
for (SargIntervalSequence newSeq : list) {
if (seq == null) {
// first child
seq = newSeq;
continue;
}
intersectSequences(seq, newSeq);
}
return seq;
}
public RexNode visitCall(RexCall call) {
List<RexNode> normalizedOperands = new ArrayList<RexNode>();
int diffCount = 0;
for (RexNode operand : call.getOperands()) {
operand.accept(this);
final RexNode normalizedOperand = lookup(operand);
normalizedOperands.add(normalizedOperand);
if (normalizedOperand != operand) {
++diffCount;
}
}
if (diffCount > 0) {
call = call.clone(call.getType(), normalizedOperands);
}
return register(call);
}
public RelOptTable getTableForMember(List<String> names) {
final SqlValidatorTable table = catalogReader.getTable(names);
final RelDataType rowType = table.getRowType();
final List<RelCollation> collationList = deduceMonotonicity(table);
if (names.size() < 3) {
String[] newNames2 = {"CATALOG", "SALES", ""};
List<String> newNames = new ArrayList<String>();
int i = 0;
while (newNames.size() < newNames2.length) {
newNames.add(i, newNames2[i]);
++i;
}
names = newNames;
}
return createColumnSet(table, names, rowType, collationList);
}
/** @return true if all tuples match rowType; otherwise, assert on mismatch */
private boolean assertRowType() {
for (List<RexLiteral> tuple : tuples) {
assert tuple.size() == rowType.getFieldCount();
for (Pair<RexLiteral, RelDataTypeField> pair : Pair.zip(tuple, rowType.getFieldList())) {
RexLiteral literal = pair.left;
RelDataType fieldType = pair.right.getType();
// TODO jvs 19-Feb-2006: strengthen this a bit. For example,
// overflow, rounding, and padding/truncation must already have
// been dealt with.
if (!RexLiteral.isNullLiteral(literal)) {
assert (SqlTypeUtil.canAssignFrom(fieldType, literal.getType()));
}
}
}
return true;
}
