private void replaceReferencedColumns(CandidateFact cfact, boolean replaceFact)
throws LensException {
QueryAST ast = cubeql;
if (replaceFact
&& (tableToRefCols.get(cfact.getName()) != null
&& !tableToRefCols.get(cfact.getName()).isEmpty())) {
ast = cfact;
}
resolveClause(cubeql, ast.getSelectAST());
resolveClause(cubeql, ast.getWhereAST());
resolveClause(cubeql, ast.getGroupByAST());
resolveClause(cubeql, ast.getHavingAST());
resolveClause(cubeql, cubeql.getOrderByAST());
}
public Set<Dimension> rewriteDenormctx(
CandidateFact cfact, Map<Dimension, CandidateDim> dimsToQuery, boolean replaceFact)
throws LensException {
Set<Dimension> refTbls = new HashSet<>();
if (!tableToRefCols.isEmpty()) {
// pick referenced columns for fact
if (cfact != null) {
pickColumnsForTable(cfact.getName());
}
// pick referenced columns for dimensions
if (dimsToQuery != null && !dimsToQuery.isEmpty()) {
for (CandidateDim cdim : dimsToQuery.values()) {
pickColumnsForTable(cdim.getName());
}
}
// Replace picked reference in all the base trees
replaceReferencedColumns(cfact, replaceFact);
// Add the picked references to dimsToQuery
for (PickedReference picked : pickedRefs) {
if (isPickedFor(picked, cfact, dimsToQuery)) {
refTbls.add(
(Dimension) cubeql.getCubeTableForAlias(picked.getChainRef().getChainName()));
cubeql.addColumnsQueried(
picked.getChainRef().getChainName(), picked.getChainRef().getRefColumn());
}
}
}
return refTbls;
}
private void addRangeClauses(CandidateFact fact) throws LensException {
if (fact != null) {
// resolve timerange positions and replace it by corresponding where clause
for (TimeRange range : getTimeRanges()) {
for (Map.Entry<String, String> entry :
fact.getRangeToStorageWhereMap().get(range).entrySet()) {
String table = entry.getKey();
String rangeWhere = entry.getValue();
if (!StringUtils.isBlank(rangeWhere)) {
ASTNode rangeAST = HQLParser.parseExpr(rangeWhere);
range.getParent().setChild(range.getChildIndex(), rangeAST);
}
fact.getStorgeWhereClauseMap().put(table, getWhereTree());
}
}
}
}
private String getStorageStringWithAlias(
CandidateFact fact, Map<Dimension, CandidateDim> dimsToQuery, String alias) {
if (cubeTbls.get(alias) instanceof CubeInterface) {
return fact.getStorageString(alias);
} else {
return dimsToQuery.get(cubeTbls.get(alias)).getStorageString(alias);
}
}
// checks if the reference if picked for facts and dimsToQuery passed
private boolean isPickedFor(
PickedReference picked, CandidateFact cfact, Map<Dimension, CandidateDim> dimsToQuery) {
if (cfact != null && picked.pickedFor.equalsIgnoreCase(cfact.getName())) {
return true;
}
if (dimsToQuery != null) {
for (CandidateDim cdim : dimsToQuery.values()) {
if (picked.pickedFor.equalsIgnoreCase(cdim.getName())) {
return true;
}
}
}
return false;
}
String getQBFromString(CandidateFact fact, Map<Dimension, CandidateDim> dimsToQuery)
throws LensException {
String fromString;
if (getJoinAST() == null) {
if (cube != null) {
if (dimensions.size() > 0) {
throw new LensException(LensCubeErrorCode.NO_JOIN_CONDITION_AVAILABLE.getLensErrorInfo());
}
fromString = fact.getStorageString(getAliasForTableName(cube.getName()));
} else {
if (dimensions.size() != 1) {
throw new LensException(LensCubeErrorCode.NO_JOIN_CONDITION_AVAILABLE.getLensErrorInfo());
}
Dimension dim = dimensions.iterator().next();
fromString = dimsToQuery.get(dim).getStorageString(getAliasForTableName(dim.getName()));
}
} else {
StringBuilder builder = new StringBuilder();
getQLString(qb.getQbJoinTree(), builder, fact, dimsToQuery);
fromString = builder.toString();
}
return fromString;
}
/**
* Find all de-normalized columns, if these columns are not directly available in candidate
* tables, query will be replaced with the corresponding table reference
*/
@Override
public void rewriteContext(CubeQueryContext cubeql) throws LensException {
DenormalizationContext denormCtx = cubeql.getDeNormCtx();
if (denormCtx == null) {
// Adds all the reference dimensions as eligible for denorm fields
denormCtx = new DenormalizationContext(cubeql);
cubeql.setDeNormCtx(denormCtx);
// add ref columns in cube
addRefColsQueried(cubeql, cubeql, denormCtx);
// add ref columns from expressions
for (Set<ExpressionContext> ecSet : cubeql.getExprCtx().getAllExprsQueried().values()) {
for (ExpressionContext ec : ecSet) {
for (ExprSpecContext esc : ec.getAllExprs()) {
addRefColsQueried(cubeql, esc, denormCtx);
}
}
}
} else if (!denormCtx.tableToRefCols.isEmpty()) {
// In the second iteration of denorm resolver
// candidate tables which require denorm fields and the refernces are no
// more valid will be pruned
if (cubeql.getCube() != null && !cubeql.getCandidateFacts().isEmpty()) {
for (Iterator<CandidateFact> i = cubeql.getCandidateFacts().iterator(); i.hasNext(); ) {
CandidateFact cfact = i.next();
if (denormCtx.tableToRefCols.containsKey(cfact.getName())) {
for (ReferencedQueriedColumn refcol : denormCtx.tableToRefCols.get(cfact.getName())) {
if (denormCtx.getReferencedCols().get(refcol.col.getName()).isEmpty()) {
log.info(
"Not considering fact table:{} as column {} is not available",
cfact,
refcol.col);
cubeql.addFactPruningMsgs(
cfact.fact, CandidateTablePruneCause.columnNotFound(refcol.col.getName()));
i.remove();
}
}
}
}
if (cubeql.getCandidateFacts().size() == 0) {
throw new LensException(
LensCubeErrorCode.NO_FACT_HAS_COLUMN.getLensErrorInfo(),
cubeql.getColumnsQueried(cubeql.getCube().getName()).toString());
}
cubeql.pruneCandidateFactSet(CandidateTablePruneCode.COLUMN_NOT_FOUND);
}
if (cubeql.getDimensions() != null && !cubeql.getDimensions().isEmpty()) {
for (Dimension dim : cubeql.getDimensions()) {
for (Iterator<CandidateDim> i = cubeql.getCandidateDimTables().get(dim).iterator();
i.hasNext(); ) {
CandidateDim cdim = i.next();
if (denormCtx.tableToRefCols.containsKey(cdim.getName())) {
for (ReferencedQueriedColumn refcol : denormCtx.tableToRefCols.get(cdim.getName())) {
if (denormCtx.getReferencedCols().get(refcol.col.getName()).isEmpty()) {
log.info(
"Not considering dim table:{} as column {} is not available",
cdim,
refcol.col);
cubeql.addDimPruningMsgs(
dim,
cdim.dimtable,
CandidateTablePruneCause.columnNotFound(refcol.col.getName()));
i.remove();
}
}
}
}
if (cubeql.getCandidateDimTables().get(dim).size() == 0) {
throw new LensException(
LensCubeErrorCode.NO_DIM_HAS_COLUMN.getLensErrorInfo(),
dim.toString(),
cubeql.getColumnsQueried(dim.getName()).toString());
}
}
}
}
}
public String toHQL() throws LensException {
Set<CandidateFact> cfacts = pickCandidateFactToQuery();
Map<Dimension, CandidateDim> dimsToQuery = pickCandidateDimsToQuery(dimensions);
log.info("facts:{}, dimsToQuery: {}", cfacts, dimsToQuery);
if (autoJoinCtx != null) {
// prune join paths for picked fact and dimensions
autoJoinCtx.pruneAllPaths(cube, cfacts, dimsToQuery);
}
Map<CandidateFact, Set<Dimension>> factDimMap = new HashMap<>();
if (cfacts != null) {
if (cfacts.size() > 1) {
// copy ASTs for each fact
for (CandidateFact cfact : cfacts) {
cfact.copyASTs(this);
factDimMap.put(cfact, new HashSet<>(dimsToQuery.keySet()));
}
}
for (CandidateFact fact : cfacts) {
addRangeClauses(fact);
}
}
// pick dimension tables required during expression expansion for the picked fact and dimensions
Set<Dimension> exprDimensions = new HashSet<Dimension>();
if (cfacts != null) {
for (CandidateFact cfact : cfacts) {
Set<Dimension> factExprDimTables =
exprCtx.rewriteExprCtx(cfact, dimsToQuery, cfacts.size() > 1 ? cfact : this);
exprDimensions.addAll(factExprDimTables);
if (cfacts.size() > 1) {
factDimMap.get(cfact).addAll(factExprDimTables);
}
}
if (cfacts.size() > 1) {
havingAST = MultiFactHQLContext.pushDownHaving(havingAST, this, cfacts);
}
} else {
// dim only query
exprDimensions.addAll(exprCtx.rewriteExprCtx(null, dimsToQuery, this));
}
dimsToQuery.putAll(pickCandidateDimsToQuery(exprDimensions));
log.info("facts:{}, dimsToQuery: {}", cfacts, dimsToQuery);
// pick denorm tables for the picked fact and dimensions
Set<Dimension> denormTables = new HashSet<Dimension>();
if (cfacts != null) {
for (CandidateFact cfact : cfacts) {
Set<Dimension> factDenormTables =
deNormCtx.rewriteDenormctx(cfact, dimsToQuery, cfacts.size() > 1);
denormTables.addAll(factDenormTables);
if (cfacts.size() > 1) {
factDimMap.get(cfact).addAll(factDenormTables);
}
}
} else {
denormTables.addAll(deNormCtx.rewriteDenormctx(null, dimsToQuery, false));
}
dimsToQuery.putAll(pickCandidateDimsToQuery(denormTables));
log.info("facts:{}, dimsToQuery: {}", cfacts, dimsToQuery);
// Prune join paths once denorm tables are picked
if (autoJoinCtx != null) {
// prune join paths for picked fact and dimensions
autoJoinCtx.pruneAllPaths(cube, cfacts, dimsToQuery);
}
if (autoJoinCtx != null) {
// add optional dims from Join resolver
Set<Dimension> joiningTables = new HashSet<Dimension>();
if (cfacts != null && cfacts.size() > 1) {
for (CandidateFact cfact : cfacts) {
Set<Dimension> factJoiningTables =
autoJoinCtx.pickOptionalTables(cfact, factDimMap.get(cfact), this);
factDimMap.get(cfact).addAll(factJoiningTables);
joiningTables.addAll(factJoiningTables);
}
} else {
joiningTables.addAll(autoJoinCtx.pickOptionalTables(null, dimsToQuery.keySet(), this));
}
dimsToQuery.putAll(pickCandidateDimsToQuery(joiningTables));
}
log.info("Picked Fact:{} dimsToQuery: {}", cfacts, dimsToQuery);
pickedDimTables = dimsToQuery.values();
pickedFacts = cfacts;
if (cfacts != null) {
if (cfacts.size() > 1) {
// Update ASTs for each fact
for (CandidateFact cfact : cfacts) {
cfact.updateASTs(this);
}
whereAST =
MultiFactHQLContext.convertHavingToWhere(
havingAST, this, cfacts, new DefaultAliasDecider());
}
}
hqlContext = createHQLContext(cfacts, dimsToQuery, factDimMap);
return hqlContext.toHQL();
}
